A mod to change LU's UI scale.
If you haven't installed my modloader yet, install it from https://github.com/lcdr/mod_loader/releases/, following the instructions there.
Download this mod from https://github.com/lcdr/options_changer/releases/, following the instructions there.
Open your client's boot.cfg file and add a new config entry named UI_SCALE with type 3 (float) and the scaling factor as the value, e.g. append ,UI_SCALE=3:2.0 to the file for x2 scaling.