Those sizes are typically set by the driver of the printer or
Windows. Illustrator just pulls the data when you click on the print dialog. If you know what you are doing you could try and edit the printer's PPD file and remove the additional sizes. Below is a quick guide based on doing this in
Windows 10 or 11 Professional. The home edition of
Windows probably won't have the MMC.exe tool and you will have to manually find the PPD file. I am not aware of any work arounds if
Windows adds the sizes.
Search for MMC.exe and open it.
Go to File and select Add or Remove Snap-ins
Find Print Manager and add it to the Selected Snap-ins
Tell it to use the Local Server
Click OK on Add or Remove Snap-ins
Expand Print Management, Print Servers,
Computer Name, and click on Drivers
Find the Driver for your printer and right click on it and select Properties.
The Driver properties will list the driver files, find the one that ends in .PPD and use the Driver Path above to locate it.
Make a backup of the PPD in case it get's corrupted, do not edit the backup.
Copy the PPD file to your desktop and then open the PPD in a Text editor, like NotePad ++.
Search the file for PageSize and remove the ones you don't want.
For instace, to get ride of A4 on my printer I would remove the below text.
*PageSize A4/A4: "
/OK@setpagesize where{ pop 0 OK@setpagesize
}{ << /PageSize [595 842] >> setpagedevice
}ifelse"
*End
Make sure the DefaultPageSize is set to a Page Size that still exists after you are done.
Save the PPD and Overwrite the one that was in the driver folder with the new file.
You will probably have to restart Adobe Illustrator for it to see the changes.