Hi Bairn_966,
Thanks for your reply,
To resize a window using keyboard only in Windows 10, follow the below steps, and check if that helps.
- Switch to the desired window using Alt + Tab.
- Press Alt + Space shortcut keys together on the keyboard to open the window menu.
- Now, press S. The mouse cursor will turn into a cross with arrows.
- Use the left, right, up and down arrow keys to resize your window.
- When you have set the desired window size, press Enter.
- Restart the PC and check if that works.
Hope it helps.
Regards,