Are you using the Table Grid Next Generation for Jira Cloud? Check its documentation here.
Are you using the Legacy Table Grid Editor for Jira Server? Check its documentation here.
Welcome to the Table Grid Next Generation documentation!
The Table Grid Next Generation is an add-on which allows you to view and edit data in a grid form. You can configure the grid via simple configuration dashboard.
Add a table to your JIRA issue view as a custom field of type Table Grid.
Use the grid in JIRA to structure your data in editable tables. Most common use cases: