I'm pretty sure it's part of State under [MainWindow] in konsolerc.
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Plasma 6 Bugs
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That could be it as I don't understand those bunch of characters on the ~~status~~ state value, but if I copy the whole konsolerc file and on a fresh install paste it back the toolbars keep visible even if I had set them to be hidden before backing the file up.
Not for me. I don't have a fresh install here right now, but if I move konsolerc and start Konsole, it comes up with the toolbars along with other default settings, if I move it back, the toolbars are gone again.
Here's my konsolerc (trimmed out some settings):
[General]
ConfigVersion=1
[KonsoleWindow]
RememberWindowSize=false
ShowMenuBarByDefault=false
ShowWindowTitleOnTitleBar=true
[MainWindow]
MenuBar=Disabled
State=AAAA/wAAAAD9AAAAAQAAAAAAAAAAAAAAAPwCAAAAAvsAAAAcAFMAUwBIAE0AYQBuAGEAZwBlAHIARABvAGMAawAAAAAA/////wAAAQABAAAD+wAAACIAUQB1AGkAYwBrAEMAbwBtAG0AYQBuAGQAcwBEAG8AYwBrAAAAAAD/////AAABbgEAAAMAAAQ+AAAC1AAAAAQAAAAEAAAACAAAAAj8AAAAAQAAAAIAAAACAAAAFgBtAGEAaQBuAFQAbwBvAGwAQgBhAHIAAAAAAP////8AAAAAAAAAAAAAABwAcwBlAHMAcwBpAG8AbgBUAG8AbwBsAGIAYQByAAAAAAD/////AAAAAAAAAAA=
StatusBar=Disabled
ToolBarsMovable=Disabled
Oh my! Yours worked. Thank you very much, this was driving me crazy for days.
Nice!