Ah, so you want to maximize and dock a program to the left edge of the screen, and dock another one right side. => Here are two ideas:
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Use drag & drop
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Or (much easier here!) use a keyboard shortcut. On Windows this should work:
Keyboard Shortcut – How to Snap a Window to the Side of the Screen in Windows 10:
- Select the program, app, or browser window you want to move. (with XClick)
- Press Windows Key + Right Arrow or Windows Key + Left Arrow (with XType)