I tried this topic but it is not possible to increase the font size.
That is because those settings no longer apply:
"When we added theme support to the IDE in 10.2.2, for the Dark Theme, these settings became unused. That's because themes carry font information. It's a useful feature and we're looking at re-enabling it again in a future release."
You may try this:https://github.com/DGH2112/IDE-Fonts
Works for me (Delphi 10.3.2)