Issue 1:
Summary of the new feature/enhancement

As a developer we are always working with multiple terminal windows at the moment, tabs make it easier, but makes it difficult in certain scenarios. If we have an ability to split the terminal screen vertically and horizontally just as ConEmu allow. It would be great.

Use Case: Some times in Platform IO IOT development the different tools run on different python version, we have to execute some commands (build. deploy) from same path but as the python version is different, we have to open two different terminals. It would be enhancing the productivity of developer if he's able to see the results on same window split to multiple terminals.

Proposed technical implementation details (optional)

Issue 2:
This is the megathread for tracking all the work related to Panes in the Windows Terminal.

1.0 Features

1.0 Features

Original issue: #532 -> added in #825

#991 Panes should be resizable with the keyboard. (fixed PR #1207)

#995 The user should be able to navigate the focus of panes with the keyboard, instead of requiring the mouse. (PR #1910)

#993 There's no keyboard shortcut for "ClosePane"

#998 Open panes with a specific profile

#994 There should be some sort of UI to indicate that a particular pane is focused, more than just the blinking cursor. tmux accomplishes this by colorizing the separators adjacent to the active pane. Another idea is displaying a small outline around the focused pane (like when tabbing through controls on a webpage). (PR:#3060)

#999 If you click on the separator's between panes, then no panes will be focused (PR #3540)

#3045 Moving focus between panes doesn't always work (PR #3958)

#3544 Add a default keybinding for panes, to enable them by default. (PR #3585)

#2834 Snap to character grid when resizing window (PR #3181)

#3960 Automatic splits similar to tiling window managers

1.x features / bugs

#1756 The user should be able to configure what profile is used for splitting a pane. Currently, the default profile is used, but it's possible a user might want to create a new pane with the parent pane's profile.

#992 Panes should be resizable with the mouse. The user should be able to drag the separator for a pair of panes, and have the content between them resize as the separator moves.

#4692 Pane focus movement doesn't remember where it came from

2.0 Features / Bugs

#2398 Move focus to the visually adjacent pane, not just the first pane on the other side of the separator.

Also: #4692 Pane focus movement doesn't remember where it came from

#3062 Add a configuration object for focused vs unfocused state

#996 The user should be able to zoom a pane, to make the pane take the entire size of the terminal window temporarily.

#5803 moveFocus to pane using number (See also #5464)

#3917 Panel split background ignores requestedTheme, follows system app mode

Add a percent parameter to SplitPane #3997

wt split-pane (multiple copies) seems to have occasional focus issues #6586

#2871 Add nextPane and prevPane keybindings (in PR #8183)

#1001 Panes should have an optional motion effect on entrance

Panes should have an animation when they're closed, too #7366

Panes Titlebar Follow-ups - See #4998

Add title to split window #4717

#7075 Allow moving panes to other tabs

Panes should have editable titles #7290

Backlog items

The user should be able to tear-off tabs and dock them as a split (See this comment)

#4587 Drag & Drop Tabs to create a Pane

Related, but different: Drag entries from the new tab menu to create panes #9229

#997 A pane doesn't necessarily need to host a terminal. It could potentially host another UIElement. One could imagine enabling a user to quickly open up a Browser pane to search for a particular string without needing to leave the terminal. (spec #1080)

#3656 Add support for tmux Control Mode

#2634 Support broadcast input (Spec #9365)

#4259 Open a new pane with the environment vars of the parent

#4340 Choose Direction to Split Pane

A switch panes option? Like a switchLeft, switchRight, switchUp, switchDown, to allow the user to rearrange the panes layout (#1000 (comment)) (#10638)

#4922 Swap panes

#4941 Please add support closePaneRight/Left/Up/Down

#5025 Open panes without keybindings

#6002 Split panes equally in size

#6219 Pass through moveFocus keys when the user has no panes

#6459 Pane focus follows mouse (PR: #8965)

Moving focus with a zoomed pane should just zoom the adjacent pane #7215

Add a fluent animation for pane zooming #7216

Pane opening animation should not flash the default pane backdrop #7365

Use a Clip rect for Pane animations instead of the Width/Height #7436

Golden Ratio mode #8562

#3586 Open a new pane by prompting the user for which profile to use

#10665

#10733

#10757

#10909 Allow moving through panes in ID order

#12186

Theming items

#3061 Add a setting to manually set the Pane highlight color (PR #3752)

Add configurable Pane border hover color #8564

#3063 Add a setting to manually set the Pane border width

#3708 Add option for more subtle pane focus border