Can't delete ubuntu from boot menu

[Ivanovic18]

Hi, I installed ubuntu, but I had some problems, so I deleted its partition in Windows Disk Management. After that I used bootrec.exe /fixmbr in cmd. I found this way of deleting on the internet.
However, when I went to the bios again in the boot menu, I still had ubuntu. I found some way via bcdedit to delete this, but when I re-enter the bios it displays ubuntu again. When I type bcdedit /enum firmware in cmd it throws out my windows boot manager and these 2 more things.
https://ibb.co/PhKBSBd
https://ibb.co/yXTgZnY

 

[lucasbytegenius]

When you choose Windows Boot Manager, it boots straight to Windows without showing the grub bootloader, correct?

 

[Ivanovic18]

Yes

 

[lucasbytegenius]

Alright, sounds like your UEFI is storing the Ubuntu boot entry in firmware. You should be able to delete it straight from your UEFI (BIOS) boot order settings.

 

[Ivanovic18]

Can You explain to me a little bit how to do that?