Apply OS: Windows, Mac, Linux
Apply Navicat Product: All
Apply Navicat Version No.: All
You can click the Stop button in the Query.
Also, you can do this by the Server Monitor function. To do so, please go to Tools > Server Monitor > Process List. In the Process List, all the process in your database will be shown, choose the query process and click the End Process button.
Note: Navicat for SQLite does not support Server Monitor function.