Hello All,
I am a newbie to Zorin (Core) and am enjoying it very much. I presently have Zorin as dual-boot with Win 11. I'd like to know what the proper procedure is to trash Windows altogether and make my laptop a Zorin-only machine.
Thanks in advance for any guidance you can offer ...
M.J.
Welcome to the Forum!
There would be the Option that You save Your Data and then make a fresh Install of Zorin and choose the Option ''Erase disk'' to completely wipe the Disk and then Zorin will be installed as the only System.
If You want keep Your current System, I would suggest the following Procedure:
Install if not already done GParted with the Command sudo apt install gparted and when installed, open it. I have to type in Your Password when You open it. This is normal. Then look for Your Windows Partitions; there should be 2 of them. A big One for the actual System and a small Recovery Partition. Make a Right-Click on both of them and choose the Delete Option. If You not sure what Partitions You have to choose, please post a Screenshot from Your GParted Window here. So, we can give You Advice what must be deleted.
The next Step would be: Open Nautilus and click at the left Side on ''Other Places''. then click on thr right Side on Your Zorin Drive. Then go to boot>efi>EFI. You will have to type in Your Password again to verify. In this EFI-Folder, You should find a Microsoft Folder. Delete that Folder - only that Folder! Don't touch any other!
When done, type in Terminal sudo update-grub and then reboot Your Machine. On the GRUB Menu You should now see only Zorin Options.
Now is the Question: Do You want keep the GRUB Menu or do You want disable it? If You want disable it, I can give You Instructions for this, too.
Thank you so much, PDL 
I will decide which of those ways I want to go, now that I have the info to proceed.
Much appreciated!
M.J.
I agree with @Ponce-De-Leon instructions for keeping your current installation but would clarify that you should do all the partition changes while booted into live USB (try Zorin) mode, not in your installed mode. If not you may have problems with mounted partitions etc. After you delete the windows partition you can go ahead and increase the size of the Zorin partition to absorb the newly created space.
That actually works without Live Mode on the System itself. I did that in the Past, too and do it now when I have another Linux Distro installed beside Zorin.
But of Course doing it in Live Mode would be an Option, too.
When I did this, I was able to remove the windows partition after unmounting it but was not able to expand the Zorin one into the freed up space without live mode because it had to remain mounted to run Zorin and couldn’t be modified while it was still mounted. I think it was @Aravisian who told me to do it in live usb.
Hmm ... interesting. For me that works.