I have Lightroom 5.7 and got a new pc laptop with a 4k display. The text in LR is very small even though I have the text at the largest setting. Is there another way to make the text larger and if not does LR6 address this issue?
You can try the trial version of Lightroom 6 and test it on your machine, however there's nothing in the interface font setting Small & Large.
Refer the discussion: Lightroom: Ability to adjust the font size options for UI