When you will create a custom App by default it will add one column name as Title and the datatype is single line of text. But sometimes the column name does not suite to your business requirement. But SharePoint does not allow us to delete the column neither it allows to change the data type of the column. But we can rename Title column, hide the Title column and we can also make Title columns as not required.
Let us first create a custom app by going to Add an app from gear icon settings menu. Then choose Custom List template from there. Then give a name for the app. You can see there will be one column name as "Title" which looks like below:
Also you can read:
Rename Title Column:
To rename a Title column, go to the List Settings page and then under the Columns section click on the Title column. Then change the Column name like below:
Then Save and the new column name will get reflected. Remember it will just change the display name of the column but the internal name will be same. The column will appear like below:
Hide Title Column:
To hide the title column and make the title as not required field follow below step. Open List Settings page and from the list settings page click on "Advanced settings" link which is under General Settings section.
Then in the Advanced Settings page, in the Content Type section select Yes on "Allow management of content types?" like below:
Then go back to the Settings page and you can see the Item content type link under the Content Types section like below:
Once you click on the content type you can see the Column in the Columns section of the Content type.
Since we have rename the column name it is displaying as First Name else the column name will come as Title.
Then in the Change Content Type Column page, in the Column Settings you can make your column as Required, Hidden or Optional as shown in the fig below. Once you choose the Option click on OK. It will Save the changes.
Hope this will be helpful.