The official PI 7 inch screen is not limited to its resolution.
In /boot/config.txt
add whatever frame buffer size you want to try

I use the following primarily because ccdciel has the same issues, cannot see all the screen.

framebuffer_width=1280
framebuffer_height=768

I do admit to having to use a handheld magnifier to enlarge some of the text in Skychart but 95%+ of all screen info is legible to be.

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