GS 2017: TM Resources: Sorting: Option is grayed out

Hi,

in GroupShare WEB UI ( 2017 SR1 CU7), under resource > translation memory tab. I want be able to sort TMs according to translation units count. But the options: Ascending/Descending appear grayed out. Same for language pairs collumn. 

Is it on purpose or is it just bug? I think it would be handy to be able to sort TMs from the biggest to smallest or the other way around.

regards,

Fana