SUMMARY The only way to disable/hide the toolbar(s) is to right-click the menu-bar and uncheck all the toolbars and then enable "Remember window size" in Settings->Configure Konsole... The Configure Toolbars... action is also missing SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE neon 5.22 KDE Plasma Version: 5.22.4 KDE Frameworks Version: 5.85 Qt Version: 5.15.3 ADDITIONAL INFORMATION The issue came with the last update
Already fixed in master and backported to release/21.08. *** This bug has been marked as a duplicate of bug 430036 ***