Hi Supp,
As far as I know, the standard behavior of the system now is that only one operation can be selected. When multiple options are selected, some buttons are unavailable and appear grayed out. This behavior not only appears on the master planning page, but also on multiple pages of the system, such as sales and purchase order pages. Many customers have encountered such issues, but this is the standard behavior of the current system.
And there seems to be no code to modify the buttons to achieve multi selection. Perhaps you can try creating a new form.
In addition, the link mentioned similar issues to yours and has been verified. Please review:
Dynamics Community Forum Thread Details
Hope it will be useful, thanks!
Best Regards,
Hana
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