This sounds a bit like a “plug the cable” to change booting modes thing. A similar thing is mentioned here Samsung - Galaxy Tab S6 Lite (Wi-Fi) - gta4xlwifi - Documentation Suggestions - #3 by mossroy
Edit, if this is your device Info about Samsung Galaxy Tab S6 Lite (Wi-Fi) - gta4xlwifi booting modes are correctly described at the foot of the page.