Created attachment 124575 [details]
KDE Connect - Please choose a file

SUMMARY
In case of very first using option described in subject is displaying "Open File" dialog with incorrect (too tiny) size (mostly width) and squeezed to 0 file name column (only icons are visible). Other columns seems to be fine.
After second use this option, File Selector dialog gets normal (bigger) size with correct width of file name column (and also other columns).

STEPS TO REPRODUCE
1. Login into KDE/Plasma
2. Click left button into "KDE Connect" icon placed in taskbar
3. Click into three vertical dots
4. Choose "Share file" option

OBSERVED RESULT
Tiny "Open File" dialog with squeezed to 0 file name column (only icons are visible).

EXPECTED RESULT
Should be shown "normal" (bigger) "Open File" dialog with "normal" (wider) file name column.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: YES
(available in About System)
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.64
Qt Version: 5.13.2

ADDITIONAL INFORMATION
Screenshot in attachment.