Created attachment 193035 [details]
Screenshot of the incorrectly sized fonts

Hi there!

I have recently started using QT6 on this Arch machine, as it hit the stable repositories. This particular workstation is using Wayland and has one QHD monitor (0) set to a scaling factor of 150%, and a 4K monitor (1) set to a scaling factor of 120%.

When using SAL_USE_VCLPLUGIN=qt5, the font scaling is proper on all libreoffice apps. 

If I don't specify SAL_USE_VCLPLUGIN, or set it to SAL_USE_VCLPLUGIN=qt6, the fonts used by Libreoffice are way too big, making dialog windows unreadable. There is a screenshot attached to show what I mean.

As another workaround, I can set scaling to 100% on both monitors, the fonts are also normally sized. For day to day work, this is not a workable solution, as scaling is the recommended way for dealing with HDPI monitors.

For now, I will be using SAL_USE_VCLPLUGIN=qt5, and I will keep an eye on this bug report.

More about my system:
Operating System: Arch Linux 
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.6.21-1-lts (64-bit)
Graphics Platform: Wayland
Processors: 32 × 13th Gen Intel® Core™ i9-13900HX
Memory: 62.5 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: TUXEDO
Product Name: PD5x_7xSNC_SND_SNE