Unusual (wrong) default saving location for output file !

Hi. This issue also happened with PDF Slicer when it's developer shifted - after my suggestion - to QPDF as background, & already fix it - see the following link: https://github.com/junrrein/pdfslicer/issues/72

Now, I discover that this issue also existing currently in version 0.4.0 which is 1st version with QPDF as the backend ! See the following screenshot:

The default location for saving is: run/user/1000/doc/..... This should not be the case ! The default saving location should be at home directory of user & then user can change it if she/he wish ....

Please your kind fix.