clean install macos catalina
Hi I need to do a clean install of macos catalina ...as my mac is running really slow ..even as i am writing this the multi coloured wheel keeps appearing ...so annoying !
so I followed instructions online ...went to "recovery HD' which suggested using "disk utility" and erase the HD and select "format type" Mac Os Extended ( Journaled) it does not show up
all i've got is : APFS
APFS (ENCRYPTED)
APFS (CASE SENSITIVE)
APFS (CASE SENSITIVE ENCRYPTED)
no Mac Os Extended ( Journaled)
could someone instruct me step by step what i need to do to m,ake a clean install of the existing macos catalina
thank you
iMac 21.5″, macOS 10.15