To remove a custom visualization from a Power BI report, do the following.
From Visualizations, select “…“. You will see Delete a custom visual:
Select the visual you would like to delete and click Delete:
You may see the warning message. Note that deleting a custom visual from this report does not affect its installation on other reports. Click Yes delete:
The visualization will be removed from the Visualizations pane and any visuals on the report canvas will also be removed.