Looks like just a different preset or setting for cool-retro-term to me. It doesn't have to be amber and super curved, the IBM/DOS preset is pretty tame IIRC. Or just go into the settings and turn off and tweak things as appropriate.

Regardless, if you want a nice terminal that isn't retro shaded and has zero UI cruft like tabs, menus, etc. check out Alacritty.