Managed hosts such as Kinsta, WP Engine, Flywheel and Pressable already cache pages at the server. Softminal Cache sees this and keeps its own page cache off, so the two do not fight.
All other features still work: JavaScript and CSS, fonts, images, Script Manager, database cleanup and the speed audit.
The same happens when another caching plugin is active. Softminal Cache never overwrites another plugin’s cache file. Deactivate the other plugin to let Softminal Cache take over.