Immersive mode in Termux?
I could have sworn immersive mode was a feature of Termux... You can still use immersive mode via ADB (or root, if you have that).

Hide both status and navigation bar: adb shell settings put global policy_control immersive.full=com.termux

Hide status bar only: adb shell settings put global policy_control immersive.status=com.termux

Hide navigation bar only: adb shell settings put global policy_control immersive.navigation=com.termux

Turn off immersive mode: adb shell settings put global policy_control immersive.off=com.termux