Summarize the following:
It's a white app with a blue paper icon that contains white lines. It's a blue circle with a white pencil icon in the lower-right corner of the screen. Use your finger or the arrow buttons on a hardware keyboard to do so. Long-tap the text and tap Select all to select all the text in the document. It's an A with horizontal lines in the upper-right corner of the screen. Tap {"smallUrl":"https:\/\/www.wikihow.com\/images\/1\/1e\/Android7expandmore.png","bigUrl":"\/images\/thumb\/1\/1e\/Android7expandmore.png\/30px-Android7expandmore.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class="mw-parser-output"><p>I edited this screenshot of an Android icon.
<\/p><p>License: <a rel="nofollow" class="external text" href="http:\/\/en.wikipedia.org\/wiki\/Fair_use">Fair Use<\/a><br>
<\/p><\/div>"} or {"smallUrl":"https:\/\/www.wikihow.com\/images\/7\/70\/Android7expandless.png","bigUrl":"\/images\/thumb\/7\/70\/Android7expandless.png\/30px-Android7expandless.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class="mw-parser-output"><p>I edited this screenshot of an Android icon.
<\/p><p>License: <a rel="nofollow" class="external text" href="http:\/\/en.wikipedia.org\/wiki\/Fair_use">Fair Use<\/a><br>
<\/p><\/div>"} on either side of the number to increase or decrease it to 2.00. The highlighted text is now double-spaced. While different paragraphs may have different spacing, all the lines in a single paragraph must maintain the same line spacing.

Summary:
Open the Google Docs app. Open the document in which to add double spacing. Tap the editing button. Highlight the text you want to double-space. Tap the editing menu. Tap the PARAGRAPH tab at the top of the menu. Set the line spacing to 2.00. Tap anywhere on the document.