Changing Task Information for Multiple Tasks - Microsoft Project Online Desktop

The version I currently use is Microsoft® Project® Online Desktop Client MSO (Version 2310 Build 16.0.16924.20054) 64-bit and I have been able to notice that the functionality to change the value of a field such as duration, for several activities at the same time, from the task information form, it is corrupted.
Naturally, I have opened a case with Microsoft to let them know that something terrible happened to the desktop tool, with functionality widely known to most experienced users. This issue, which I assumed would not go further, has become my frustration for a long time. What happens is that the ticket was escalated until it reached the experts who have informed me that what I have seen (impossibility of changing several tasks at the same time) is correct behavior. That is to say, there is no bug, it has never been possible to change several tasks at the same time from the task information form. Frankly, I don't know what else to do, they say that they checked with the experts and that I am wrong and they insist on closing the case. Any suggestions?