Hardwave Studios / Plug-ins / WideBoi
WideBoi
Stereo width in three bands, with the low end kept in mono.

What it does
Three bands
Low, mid and high, each from mono to four times as wide, with its own mono switch.
Mono bass
Everything under the cutoff is summed to mono, so the low end stays centred however wide the rest goes.
See the field
A goniometer and a correlation readout that warns before the mix folds on a mono system.
Details
Questions
Any DAW that loads VST3 or CLAP: FL Studio, Ableton Live, Bitwig, Reaper, Studio One, Cubase and others.
No. WideBoi is in Pro. Open the Suite and install it.
Also from Hardwave Studios
Works with the rest of the studio
Analyser: see your mix: spectrum, loudness, true peak and stereo width per band. WideBoi will be free inside Hardwave DAW. Keep the project and its samples in Workspace.