Connecting MacBook Pro (2017) to iMac to use as another display

For the setup you describe, the iMac 27-inch 2013, running macOS High Sierra or earlier could be used as a monitor.

IF your MacBook Pro 13-inch is from 2019 or earlier AND running macOS Catalina or earlier, then connect the two with a Thunderbolt or Thunderbolt 2 cable.

Please read carefully this support document that details the former target display mode –

Use your iMac as a display with target display mode - Apple Support:

https://support.apple.com/en-us/HT204592

In a nutshell:

Target display mode is a feature that was available only with certain older iMac models.

Only the following older iMac models can be used as an external display when plugged into another older Mac model:

• iMac models introduced in 2011, 2012, 2013, and mid 2014 using Thunderbolt or Thunderbolt 2 cable.
• 24-inch and 27-inch iMac models introduced in 2009 and 2010 using Mini DisplayPort cable.
• The intended target iMac must be running macOS 10.13 High Sierra or earlier.
• In all cases the source Mac that you're connecting FROM must have been introduced in 2019 or earlier and have macOS 10.15 Catalina or earlier installed.

Unfortunately, that setup is not supported by Apple. The MacBook Pro cannot be used as a monitor for any other Mac, and neither can the new 24" iMac be used as a monitor for the MBP. Target display mode is no longer a feature of macOS and never did support the MBP AS a monitor.

You're welcome.

Hi can I check if I have a MacBook Pro 13" and the older 2013 iMac 27 inch is there any way of displaying the screen from the MBP on the iMac?