How to modify the grayed out "AND" from the query in Custom Charts?

[Keiko Kamiya]

In the 2D Table from Custom Charts, I put in the Source as Saved filters called "AllProjectIssues" but it adds a default "AND" after it whenever I try to add a "Group By" segment:

I also tried using Custom JQL as the Source and it still provides the "AND" after it as the default. How do I modify the grayed out query?