Thank you for that insight on the program's bug.
Coincidentally I came across the crop tool on the right hand side, which allows for a much more ideal way, IMO, in implementing the black bar.
I was wondering how I may inform Resolve, to, for example, implement said "crop" from 15 second mark to 20 second mark, or ideally how ever long the imported image on the V2 or V3 'track' is set for?
I'm aware of nodes in the 'color' tab, adjacent to the 'media' and 'edit' tab at the bottom, used in conjunction to implement blur/censorship effects.
Edit: I'm aware a possible 'improvisation' is to use the 'blade edit tool' to split the video into 3 parts and I guess from there select the middle video and perform the 'crop' on there.
To unblade / undo-blade, one select the points where there is a cut, generating
a green dash line, and press the back space key.
https://i.imgur.com/t9BKJQT.png