Typo3 - Tables can’t be edited after a Typo3 upgrade.

During a Typo3 Upgrade it is possible that tables created via the RTE can’t be edited as before. Adding, deleting of rows and columns is no longe possible. How to fix that issue?

A few lines in the RTE Configuration file ( yaml ) will fix that problem:

table: 
        defaultHeadings: { rows: 1 } 
        contentToolbar: 
            - tableColumn 
            - tableRow 
            - mergeTableCells 
            - tableProperties 
            - tableCellProperties

Further reading: