How Do I Reclaim Purgeable Space on Mac?
On your Mac, nudge the Apple logo in the top left of the screen.
Click through the options available to you to conserve space.

How Do I Reclaim Purgeable Space on Mac by Rebooting?
Here’s how to do so.
The method typically clears out temporary items, and many caches meaning your purgeable space should reduce temporarily.

hit the Apple logo on your desktop.
Your Mac will now restart having cleared many of its temporary files in the meantime.
How Do I Reclaim Purgeable Space on Mac by Clearing the Cache?

Experts generally recommend leaving macOS to handle temporary files by itself and reboot rather than delve into them yourself.
Hold down the Option key and clickGo.
Choose which caches to delete.

It’s possible to remove all if you so wish.
Empty the trash can to remove the temporary files permanently.
What Is Purgeable Memory?

What Does Purgeable Space Mean on Mac?
This purgeable space is only removed when needed by the operating system.
It rarely needs to be removed manually.

Can I Use Third-Party Apps to Clear Purgeable Space?
Typically, few macOS users need to do this unless free space is quite limited.
Your Mac automatically removes purgeable files when space is needed.

Apple introduced the idea of purgeable space in macOS Sierra.
If you’re running an older macOS or OS X version, considerupdating your macOS.