Please check whether your app keeps a previously installed version of each tool – this is by design to enable instant rollback. You can delete previous versions to save space. Click Remove the previous versions under the Keep previous versions of tools to enable instant rollback toggle settings in the Tools section of the app’s settings. Note that if you do this, you’ll lose the ability to instantly roll back to a previous version.
You can also clean up the leftover tool directories and clear the download cache. In order to do so, navigate to Toolbox App Settings, expand the Tools section, and look for the lines Clean up leftover tool directories and Clear download cache, which will immediately tell you how much space they occupy. Follow the Clean up leftover tool directories link to see a detailed breakdown of the leftover directories grouped by the tool that created them and sorted by the modification date. You can delete each tool’s directories individually, or all of them with a single click.