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says this applies to Rulers, in the option pane, but changing it does nothing and the ruler text shows up way tiny (on 4K display).
OK, I take that back - the font size does change - but it changes from no-way-readable, to barely-readable on a 4K. Maybe I should ask for an Old Guy Font option added to the general text size pulldown?
That has been mentioned somewhere else already. Now there is a ticket: https://github.com/KLayout/klayout/issues/394