Currently, the only way to manage subscriptions is to click on each individual channel within the "subscriptions" details element in the subscriptions page and hit unsubscribe.

Updating the subscriptions details element for managing subscriptions, where the channel is listed on the left side (already done) with the unsubscribe option on the right side would be useful.

It would look somewhat similar to how Invidious currently does it.

Please see here for a screenshot of how Invidious' Subscription Manager looks.