I recently installed the elvUI addon and configured it, but i couldnt find any settings that make the panels bigger (character panel, talents panel). I have a 4k monitor and installed the addon with the option "High resolution". Changing the resolution on "video" didnt work either....
You should be able to adjust the UI scale accordingly. At default, ElvUI will scale the UI to a pixel effect ratio normally around 64. Adjust the slider in he video options and it should move to wherever you set it to. Otherwise if you find this to be a bug, report it on the issue tracker: https://github.com/ElvUI-TBC/ElvUI/issues I personally do not have a 4K res monitor.