- OS:Ubuntu 20.04
- Database Type:MySQL 5.7
When you run SQL statements that take a long time to execute, one can cancel the execution by pressing the "power off" button

Although in the UI the execution of the statement was apparently stopped the execution is still alive in the database.
One can check it by executing:
SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = '<your_username_here>' ORDER BY TIME DESC;
It would make sense that this poweroff button, could retrieve the ID of the statement that is being stopped and kill it, i.e. by executing KILL <ID> where the ID is got from the PROCESSLIST table.