...
Scroll down and click on which cache you want to clear
e.g :
slack.cache.channels.* which is public channels
slack.cache.group.* which is private channels
Page Comparison
Manage space
Manage content
Integrations
...
Scroll down and click on which cache you want to clear
e.g :
slack.cache.channels.* which is public channels
slack.cache.group.* which is private channels