You can remove seats from your Suitcase Fusion subscription from your Subscriptions page. Click the three dots on the right side and select "Change quantity".
Note: You must have open seats equal to the number you want to remove from your subscription.
The Change Quantity page shows your current subscription amount. Under New Quantity, click the minus (–) button to remove seats from your seat count: if you have three seats and want to remove two seats, the new quantity should be 1. You can also enter the desired quantity directly.
The summary at the bottom of the page will show the cost of your next subscription renewal; your new subscription renewal amount takes effect on the change effective date.