what is the option to get the retouch button in photos. Feature gone after sequioa upgrade.

From the support document link provided by leroy douglas...

Note: Retouch is available on Intel-based Mac computers and on Mac computers with macOS Sequoia 15.0 or earlier.

So Retouch is not available on M series Macs but the support document lists ways to improve photos on an M series iMac 24.

dpieman wrote:

"Retouch" is a must have tool to clean up photo imperfections. What is Apple's alternative replacement for this feature?

is this Intel mac or M-series mac...?

I see it on Intel running macOS 15.3.1

for M-series Mac see the ref:

Remove distractions and imperfections from your photos on Mac