In TM Maintenance Editor, you need to use Batch tasks, selecting all doesn't really make sense in this context, as TM might contain several millions of TUs.

As for Select All in Online Editor, this feature will be delivered rather soon.

Thanks Patrik, that's good news about the Online Editor! 

In Maintenance Editor, as far as I can see, batch actions are limited to finding and replacing text, deleting tags, and changing and deleting field values; the field values that can be changed are in turn limited to the custom fields, and a couple of others - so this function doesn't enable changing of status in bulk. Additionally, filtering does not allow filtering status on "signed off" or "not translated". So while I'm open to using batch actions to make bulk changes in Maintenance Editor, this does not currently seem to allow finding and changing status. 

Yes, I see now, I logged an improvement request and we will see when we can address it.

Many thanks, happy to discuss further if of assistance. 

Many thanks, happy to discuss further if of assistance.