Everything looks too big on linux in wayland and SAL_FORCEDPI only affects the Calc content not the rest of the UI. And it doesn’t affect the libreoffice launcher that shows the preview of all recent files. The preview images for those files are very large and blurry. How can I change the scaling for the whole interface just in libreoffice not system wide? Other applications I can change the font size and everything scales with it but of course libreoffice doesn’t make it easy.
Take a look at your Display Configuration to see what scale factor is applied to your screen. I had that problem in the past and solved it by changing the scale to 125% on my main monitor (2560 × 1600).