Hello @thompsonweb2
I trust you’re doing well!
Out of the box, Smush doesn’t have this option as there is no way to tell Smush which image is used on pages and wich on posts.
As a workaround, you may try changing the upload dir for post images. The Smush automatically optimizing images that are uploaded to the /uploads/ folder. So if a dir folder will be different images could be possible to optimize only when going from Smush > Directory Smush. Please see an example of code here:
https://wordpress.stackexchange.com/questions/95829/set-custom-upload-path-for-custom-post-type-only
There is an option as well, that allows Ignoring images. Please go to Media Library and choose which images you wish for Smush to ignore. Please see this screenshot:
https://take.ms/xo1pM
The Ignore link is shown only for images that are not optimized yet.
Have a good day and take care!
Cheers,
Nastia