Figma app closes automatically when minimized on macOS Sequoia

We can not be 100% certain there is or is not an issue with the Figma application in and of itself

Though, if we combine the usage CMM application into the overall.

The current issue may have been caused by CMM ( CleanMyMac )

An aside

You may consider and from Your User Account on these Forums

Profile >> Edit Profile and Preferences >> Other Preference >> Default thread sort >> Change it to " Oldest "

In this way, you will see the replies in a more usable order

Part1 of 2

Start Over from Scratch 

Once this type of software is installed and embedded into the computer >> CleanMyMac aka BrickMyMac <<

You can spend hours or days hunting down all the bits and pieces of this software and never really get it all off the computer 

For Apple Silicon computer >> Use Disk Utility to erase a Mac with Apple silicon.

For Apple Intel computers >>   Use Disk Utility to erase an Intel-based Mac followed by How to reinstall macOS

Always make a Time Machine Backup  before  proceeding 

If going this route - I suggest Not using Startup Assist to migrate everything back.

This will probably Re-Introduce ( CleanMyMac ) back into the Operating System 

Part 2 of 2

Specific to CleanMyMac aka “ BrickMyMac “

To put the CleanMyMac in context and the damages it may have or has already done.

This application can or will Muck Up your User Account ( Home Folder ) of this machine.

It does not touch the Operating System itself unless you consider your User.

 Account ( Home Folder ) as part of the Operating System

Then in that specific context - it has Mucked Up the Operating  System 

The Operating System is hosed 

FWIW, no one who owns a Mac should install CleanMyMac. First rule of thumb, never install junk.

Just to add, you might want to contact Figma Support.