No "Docked Mode" option in "Preview" settings in Android Studio once undocked

Solution 1:

Here is the simple solution for reverting to "Docked Mode".

1. Select the Preview Window
2. Go to Window menu > Active Tool Window

There you go. The Preview window is in Docked Mode. And there is the option for Docked Mode again.

Solution 2:

Option 1

First open any layout file to set the preview as active window. Then as the first answer says, goto Window in menu > Active Tool Window > Select Pinned Mode, Docked Mode and Split Mode

Option 2

Open a layout file. If the preview window doesn't appear, first make it visible by clicking View in menu > Tool Windows > Preview. Now preview window will appear. Then right click on the Toolbar in the preview window itself (the one with blue color) to show a list of options. Then there, select Pinned Mode, Docked Mode and Split Mode

Regards.