[Samsung Galaxy S9  Themes, Apps, and Mods] HarrisonD4Y:
This guide will show you how to theme your One UI 2.0+ Device to look and feel like stock android/pixel look.

THIS GUIDE WORKS ON ALL ONE UI DEVICES HOWEVER IT WAS TESTED ON ONE UI 2.5.

I have now created 2 sections "Basic" or "Extra's".

YOU DO NOT NEED ROOT!

PRE REQUISITES:

A Samsung device using One UI 2.0+

An internet connection

Ability to download apps

The Basic Stuff:

STEP 1: [VOLUME PANEL]

Download this from PlayStore:

Volume Styles - Customize your volume panel https://play.google.com/store/apps/details?id=com.tombayley.volumepanel

Open the app, at the top right press "Start". This will ask you for some accessibility settings, after you've done this, go back to the app and select "Android", you may have to scroll down an inch or two. After this step you can test your volume keys and see it it worked. Congratulations you now have a stock android volume panel!

For darkmode users: After you've followed the steps above, press "Style Settings" found at the bottom of the app, find the "Auto Dark mode" option and toggle it. The panel should now match your darkmode settings.

STEP 2: [STATUS BAR QUICK SETTINGS]

Download this from PlayStore:

Power Shade: Notification Panel And Quick Settings

https://play.google.com/store/apps/details?id=com.treydev.pns

After the app has downloaded, open it, when you first launch the app it will prompt you for some accessibility settings like the last app did, after you've completed this go back to the app and select "Heads Up" and turn OFF "Colourize Pop-Up Badge" and turn ON "Disable Pop-Up Badge".

Now scroll down and open your quick settings and check it out ;)

Feel free to customize this app to your liking, I'm just leaving this as the bare minimum to get you up and running with a stock look.

STEP 3: [LAUNCHER SETUP]

Download this icon pack:

Pixel Q Icon Pack

https://play.google.com/store/apps/details?id=ru.pt.iconpack.pixel_q

(I think this pack is the best FREE icon pack for a stock look, if you have any other suggestions please leave them below!)

No need to open this app.

Download Customized Pixel Launcher:

Customized Pixel Launcher

https://play.google.com/store/apps/details?id=ru.whatau.cpl

Press your home button, you will get a prompt asking you which launcher to choose, select CPL (Customized Pixel Launcher). Press and hold the homescreen until a menu pops up with various options at the bottom, press "Icon Pack" and select the icon pack we just downloaded. This took me a few tries as the icon pack kept going back to the system default, but it eventually worked after a few attempts of reselecting it. Feel free to customize this launcher to your liking, however for this guide I will only be changing the grid size for home and desktop. So press and hold the homescreen again and select: "Home Settings" now go into home screen and change the grid size to 5x6, I found this the best on my Galaxy S9, however it may be different to yours. I chose the same on desktop and left it at that.

Screenshots will be added soon.

Extra Tweaks:

These tweaks will only work on One UI Devices.

NAVIGATION BAR:

I haven't tested this but it should work, if it doesn't please update me in the comments.

Open galaxy store, search for "Good Lock" and download the app. (I've heard stuff about this being locked in some countries, it most likely is, I'll try to test it ASAP!).

After you have Good Lock downloaded open it and select "NavStar". This will bring up the NavStar download page from the Galaxy Store. Download it and return to Good Lock. Once its downloaded launch it again through Good Lock and toggle it on. Find the style you like, you can even make your own, soon I will be making my own pixel icons and uploading them to here for everyone to use since the built in pixel icons are kinda trash. Have fun :)

REMEMBER TO HIT THANKS!

I WILL BE ADDING MORE WAYS SOON!