Hard Drive doesn't show in Recovery Mode I was trying to go back to OS X El Capitan with Recovery Mode, but after agreeing to the T&amp;C, it tells me to choose a HD where to install the update, but it doesn't show up. What can I do?
I'm currently running macOS 10.15.6 w/ my MacBook Pro (Retina, 13-inch, Early 2015)

EDIT: This is what the disk utility GUI and what the diskutil list shows.
'Going back' &amp; 'update' are mutually exclusive terms.
You will need to re-format the drive to HFS+ first from Disk Utility. El Capitan cannot read or understand the APFS disk format that Catalina uses.
Your edit suggests you are still in Catalina &amp; that your disk is currently APFS.
You will need to start from your external El Capitan boot medium [or from Internet Recovery] in order to be able to format your boot drive [you cannot format the drive you are booted from, for obvious reasons.]
Select the Physical disk in the left column [Apple SSD] &amp; select Erase. Set to GUID/HFS Extended, Journalled.