You can suspend the accounts of your company members.
Suspension of KANNA accounts can only be done from the web app and the member who is the "Owner" and "Compay Administrator" can edit.
Please refer here for your authority setting.
1. Tap "Members" from "Setting" on the top page.
2. Select the member you want to suspend
3. Click on "Suspend account" at the bottom
Once you suspend the account, the login will be disabled and notifications will be turned off for the suspended account.