Modify screen resolution aarch64

Tumbleweed aarch64 - After booting a portion of the screen at the right is missing. The resolution set is 1024 x 768. I would like to set it to 1024 x 700 or something similar. Online help instructions don’t seem to apply to this version of ARM Tumbleweed. Could someone please point me to a solution? Thanks in advance.

Closed for the moment and moved to Hardware.
Nothing to do with Multimedia.

Now reopened

Use xrandr to see what resolutions are available and the use xrandr -s option to set…

Many thanks. Problem solved.