MEGA-X (de)select all genes

Question

[RvV]

We have been using 32-bit versions of MEGA for years in our teaching activities. Due to requirements for 64-bit software on current mac OS's I am rewriting our teaching assignments for MEGA-X. However, some functionality seems to be missing. Specifically, when loading a data set with many gene annotations, I can no longer find a toggle to (de)select all genes. Of course, manually (de)selecting all genes individually is a lot of hassle for students.

Does anyone know if there is a way to (de)select all genes in MEGA-X?

Thanks