I've started using base on KDE5 and am finding the downward arrow on DropDown boxes very small. The default VCL appears to be gtk3. Changed the VCL to kde5 and now the arrow on DropDown boxes appear at a reasonable size, but the dialog boxes are a lot smaller.
Created attachment 178782 [details] KDE5 with small dialog This attachment illustrates a dialog that appears small when using VCL KDE5
Created attachment 178783 [details] GTK3 dialog This attachment illustrates a dialog that appears appropriately sized when using VCL GTK3
I see two screenshots of the same dialog. One screenshot show the whole screen of KDE, the other a database screen in the background an the dialog in foreground, which seems both be only a part of the screen. Look at the list of forms in both of the screenshots. What do you want to show with both screenshots? Has this anything special to do with Base or has it to do with UI, the user interface?
Created attachment 178801 [details] Using SAL_USE_VCLPLUGIN=qt5 results in much smaller dialogs The attachments should refer to what I obesered when exporting qt5 or gtk3 using SAL_USE_VCLPLUGIN. I've removed the attachment with KDE5 in the name as it was unhelpful as explained by Robert. I've added the qt5 png which hopefully demonstrates the problem I'm seeing My tests are 1. Start a terminal session 2. export SAL_USE_VCLPLUGIN=gtk3. 3. Start LO 4. From the menu bar Tools -> Options 5. Observe the size of the Options dialog 6. Stop LO 7. export SAL_USE_VCLPLUGIN=qt5. 8. Start LO 9. From the menu bar Tools -> Options 10. Observe the size of the Options dialog 11. Stop LO When comparing the sizes of the Options dialog I'm finding that the options dialog when using SAL_USE_VCLPLUGIN=qt5 is about half the size of the options dialog when using SAL_USE_VCLPLUGIN=gtk3. The end result is that some of the details in the Options dialog when using qt5 are very difficult to read. Another example is 1. Start a terminal session 2. export SAL_USE_VCLPLUGIN=gtk3; libreoffice --writer 3. From the menu bar Help -> Show tip of the day 4. Observe the size of the tip dialog 5. Stop LO 6. export SAL_USE_VCLPLUGIN=qt5; libreoffice --writer 7. From the menu bar Help -> Show tip of the day 8. Observe the size of the tip dialog 9. Stop LO When comparing the sizes of the Tips dialog I'm finding that the Tips dialog when using SAL_USE_VCLPLUGIN=qt5 is about half the size of the Tips dialog when using SAL_USE_VCLPLUGIN=gtk3. The end result is that the details in the Tips dialog when using qt5 are very difficult to read.
There isn't only the dialog "smaller". The whole window is shown in the same resolution. Look at the background. Whole Window of Base has smaller characters in your kde5-screenshot than the gtk3-screenshot. I couldn't test it with gtk3, because I won't install gtk3 here. Work only with kde5 and no problems appear. The height of the font in LO will be depend on the system settings in KDE. So have a look at the settings in gtk3 and KDE.
Comment from https://bugs.launchpad.net/ubuntu/+source/lubuntu-meta/+bug/1895216 SAL_USE_VCLPLUGIN=qt5 by itself isn't tested upstream and definitely experimental. If you really want to use it, set SAL_VCL_QT5_USE_CAIRO=1 in addition, which *should* probably work pretty well (mostly like the "kf5" plugin, which is used by default on Plasma and LXQt according to LibreOffice's default selection mechanism), but is also not tested/used by upstream.