When you choose 'Bulk Actions' on additional actions (top right button on Tasks), you'll get a page to select multiple tasks like above. After selecting the tasks, you can delete or check selected tasks. Also if you tap an arrow at the right, you'll get all your 'Quick Actions' that will let you edit your tasks right away.
3 types of sort options are available. Main option will categorize your tasks and others will sort the ones inside accordingly. Inside 'List Order', you can change the order of lists to sort from. If you move 'Single Lists' in Lists view, list order will also change accordingly.
Each smart lists can have it's own Sort Options too. Edit 'Sort options' by editing the list (or choose Sort option on 'More ...' button). Check off 'Default' and you can set up it's own.
When you choose 'Share List' on additional actions, you'll see a share sheet that you can choose from. Choosing Mail will give nicely designed form of your tasks. Also you'll get text-based tasks list to share to any other apps you have installed.