>>1349975
>>1349983 (me)
AHAHA I figured it out without the client!
I didnt know it was called split tunneling, so I researched a bit using that new terminology.
With your post and this forum post from 2021 https://forum.kde.org/viewtopic.php%3Ff=18&t=171315.html
I managed to figure it out.

>1) Downloaded the wiregaurd config file from mullvad
>2) Add that preconfigured vpn file to KDE network manager using the dropdown menu
>3) Click on that connection -> IPv4 tab -> Routes (bottom right) -> check "use only for resources on this connection" box, described as "If enabled, this connection will never be used as the default network connection".
> 3.1) Do the same in IPv6 tab
>4) Go to Qbittorrent settings -> advaced and select the vpn connection under "network interfaces" (as you described in your post)
>5) Disconnect and then reconnect to the VPN

I checked the Mullvad website in my browser, which showed I wasnt connected. Then I used a torrent-IP-checker site to download a magnet link and see the ip they got from me and it was using my vpn!
Everything worked!

I couldn't have done it without your help, thank you anon.