[Feature request] "maximise" current sub-term

[hydrargyrum]

Is your feature request related to a problem? Please describe.
It's possible to split qterm screen into smaller sub-terminals, but sometimes, one wants to have a sub-terminal bigger temporarily, hiding other sub-terminals during this time.

Describe the solution you'd like
An action (with shortcut) to toggle "big" state of a sub-terminal that hides other sub-terminals in the same tab.
This feature exists for exemple in terminator, another screen splitting terminal app.

Context

I use terminator frequently with sub-terminals like in qterminal, but sometimes I want to have a subterminal taking the whole window, temporarily to do some stuff like an ncurses app or viewing a lot of data. There's a shorcut in terminator to toggle that. Then when I quit the task in the subterminal, I press the shortcut again to toggle back the splitting state and see other subterminals as before.
This doesn't exist in qterminal and prevents me from using sub-terminals.