Compared to Studio and Translation Memories view, batch editing of TMs in Trados Live is much more complicated.

If you are in the TM Maintenance Editor, you still cannot see e.g. Find in Source, Find in Target, Replace. You have to click Filters, On, Basic and then type the text in the Source Text field. And pressing Enter does not work, you must click on Apply. 

If you want to make batch changes, there's even more to click: write the Source text you want, click on Apply. Then Batch Actions, Choose operations, Edit translation units, Next, Find and replace text.

C'mon! Are you serious about this? Have you ever heard about Lean thinking? Compared to editing TM in Studio, where you have nearly all these fields visible in the TM view, I'd say this is causing trouble and loss of valuable time. And then you have the View tab, where you can switch between different editor themes - who needs such ridiculous things, compared to smooth find+replace and batch editing? 

Return those buttons and icons on the first page of the TM Maintenance Editor, please.