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Changing the text size is very confusing in Windows and in LR -- a bit of a mess.
1. Right-click the desktop and select Display Settings:
Make sure Display Resolution is set to the Recommend value (the native resolution of your display). Close Settings.
2. In the Windows search box, type "make text bigger" to get to these settings:
Set the Make Text Bigger slider to 100%.
To change the size of the menu bar at the top of LR (File, Edit, Library, Photo, etc.) select a different percentage in the Make Everything Bigger box. Otherwise leave it at 100%.
3. To change the size of all text in LR except the menu bar, go to Preferences > Interface and change Font Size to a different size:
Beware that LR has lots of glitches when you set Windows Make Everything Bigger to other than 100% or LR Font Size to other than Automatic.