Users can enable this behaviour by enabling the `Termux Settings` -> `Keyboard I/O` -> `Soft Keyboard Only If No Hardware` toggle.
Currently, for this case, soft keyboard will be disabled on Termux app startup and when switching back from another app. Soft keyboard can be temporarily enabled in show/hide soft keyboard toggle behaviour with keyboard toggle buttons and will continue to work when tapping on terminal view for opening and back button for closing, until Termux app is switched to another app. After returning back, keyboard will be disabled until toggle is pressed again.
This also may help for the Lineage OS bug where blank space is shown where soft keyboard should be if "Show soft keyboard" toggle in "Language and Input" is disabled. Check KeyboardUtils.shouldSoftKeyboardBeDisabled() and https://github.com/termux/termux-app/issues/1995#issuecomment-837080079 for details.
The `TermuxPreferenceConstants` class has been updated to `v0.10.0`. Check its Changelog sections for info on changes.
This `soft-keyboard-toggle-behaviour` key can be used to change the behaviour. The default behaviour is `show/hide`. The user can set the value to `enable/disable` in `termux.properties` file to change default behaviour of keyboard toggle buttons to enable/disable. In this mode, tapping the keyboard toggle button will disable (and hide) the keyboard and tapping on the terminal view will not open the keybaord automatically, until the keyboard toggle button is pressed again manually. This applies to split screen and floating keyboard as well. The keyboard can also be enabled from Settings -> Keyboard I/O -> Soft Keyboard toggle. Running `termux-reload-settings` command will also update the behaviour instantaneously if changed.
Fixed issue where "hide-soft-keyboard-on-startup" property wouldn't work if Termux app was switched back from another app. Fixes#1098
Fixed issue where soft keyboard may not show on startup on some devices but it still may fail sometimes.
The `TermuxPropertyConstants` class has been updated to `v0.7.0`. Check its Changelog sections for info on changes.