MacBook Pro has extra start up disc from previous os

Using the Terminal app, run the following command to provide us with the full drive layout (make sure to disconnect all external drives first to minimize the amount of information output):

diskutil  list 

Since you used a patcher to install an unsupported OS, I have no idea what side effects it has on the laptop. You may need to check with the developer of the patcher you utilized on how to return the laptop to its former state. You can try a PRAM Reset (hold for at least three chimes) to see if it has any affect on revealing the full drive layout. Also, telling about using a patcher to run an unsupported OS is very critical information to have.

You may have to start over from scratch by re-partitioning & formatting the whole physical drive as mentioned in this article if booting a macOS 10.6 to 10.10 installer:

https://eshop.macsales.com/tech_center/formatting/Mac_Formatting_6-10_R3.pdf

If reinstalling macOS 10.11, then erase the whole physical drive as GUID partition and MacOS Extended (Journaled).

The physical drive will usually appear with the make & model of the drive and should be the top most item on the left pane of Disk Utility (at least for the internal drive).

FYI, this is one of the dangers of using unsupported configurations & tools. It is up to you to fully understand how they work and how to undo things (if it is even possible to undo them).

SohoSoho Said:

"MacBook Pro has extra start up disc from previous os: Hi,how can I get rid if the extra start up disk (from previous os) on my MacBook Pro? (The picture) I don’t see it in the Disk Utility or Startup Disk…The Mac OS is El Captain."

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Unmount this as a Volume:

In Disk Utility, is this seen as a volume? Click on one of the drives, and see if it is a volume that you need to delete.

I don't use Windows on a Mac so I'm not sure if the "EFI Boot" option is normal or not....my guess is Windows was installed without using BootCamp Assistant. The "EFI Boot" option/partition may be an Apple bootloader partition which is normally hidden from view, but perhaps the Windows installation unhid it, or perhaps this is just a Windows partition containing a Windows bootloader. Hard to say without seeing the contents of that partition, but you don't want to delete it.

As for the "Recovery 10.11.6" boot option, that should have been removed if you had installed a later version of macOS, but maybe how Windows was installed played a part in not being able to remove the El Capitan recovery partition which means you probably won't be able to reclaim the space without starting over with a clean install of macOS.

If you are now running macOS 10.13+, then within Disk Utility click "View" and select "Show All Devices" so that the hidden partitions & containers appear on the left pane of Disk Utility. At best you can just erase the "Recovery 10.11.6" partition. Keep in mind later versions of macOS will also have a "Recovery" volume which you do NOT want to touch. The one downside of erasing the "Recovery 10.11.6" partition is that you will now have this storage area showing up in the Finder. I believe you will need to be booted into Recovery Mode in order to erase the partition for "Recovery 10.11.6". Just make sure to choose the correct item to erase, the partition may not have a distinguishing name and may just appear as "Recovery" so it may be difficult to tell which "Recovery" item is the extra one.

Before doing anything, make sure you have a good backup since you could make the Mac unbootable for either the macOS or Windows installations.

If you don't see it in DU or the Startup Disk, where are you seeing it? What is the screen shot of?