You can tag records in the database to help organise them. New tags are simple to create, and an assigned tag is easy to remove.
Step 1: Select the record

Inside the grid, double-click the record that you want un-tagged.
Step 2: Click Tags

Tags are displayed at the top so that you can see them whenever you open this record again.
To remove a tag or tags assigned to this record, select the Tags command on the ribbon.
Step 3: Choose the tag

Choose the tag or tags that you want to remove in the right-hand side panel under Selected items, and click on the <-Remove button.
When you have removed the applied tag or tags from the right-hand panel, click Ok to view the result as shown below.
Step 4: Observe the result

You can see that there is now no tag attached to this record.
OR
Alternatively, the same action can be performed by following these steps.
Step 1: Select Tag as...

Inside the grid, right-click on the record that you want un-tagged, and choose Tag as...
Step 2: Choose the tag

Choose the tag or tags that you want to remove in right-hand side panel under Selected items, and click on the <-Remove button.
Finally, click Ok to finish.