Yep, I never got along too well with Cura, I never really could zoom into a object too close without it was moving out of the screen. That was a thing I really hated, might have been that I missed a setting, but it was the same with the MP3DP and the Ender3.
I have no idea why I came to Cura, I got my first printer in December 2018 (Ender 3), probably recommended by some guys on the Ender forums??? Well they had the Ender3 config ready to use, even a dumb like me could jump into 3D-printing with no knowledge.
I refused to update, but when the PC crushed, the new version 4.?? looked like something I never saw b4.
Just one thing to be sure, it looks to me that slic3r is not installed on your system, it looks much like a portable version to me. Is that normal? or did I something wrong?