If you want to remove your published insight (Charts, Data, Dashboards, Notes, etc.) from the Exploratory website, but the original insight is not available on your Exploratory Desktop anymore for some reason like you have already deleted the project, you can delete it by using a web browser.
Log in to https://exploratory.io/ with a web browser, click the user icon and select “My Insights”. Then you will see a list of your insights. You can delete the insight by clicking the trash icon of the insight you want to delete.