How to delete "Switch OS"

Hi! Sorry for my english.
How can i delete Switch OS in chuwi hi10 PRO, with serial LQ64G4216120…
I need only windows x64 system without android. I also delete Android part of disk. But i still see boot selector.
May be i need to flash bios? In the bios for my tablet boot selector is active

If you have already removed the Windows program to change the system, say so and I will put the link to download it. Install it and follow point 3 of the tutorial

https://1drv.ms/u/s!AqpKvT8-VB_8t150c07rF_uqovm9?e=bKDYNQ