Hello 
UPDATE 
Bulk Select is now available in this theme.
The bulk select is a little different like on the Default theme because of the layout and topic list boxed design.
It can be activate with the floating button on the bottom. After you click this button the topic list whole topic box will be clickable to select so no matter where you click. The Dismiss… button is sticking to the top of the page on desktop while the bulk select active and you scrolling.
This update fix an issue when you have activated bulk select and navigate to a discovery page where the bulk select is not an option but the topics still selectable.
On mobile while the bulk select active we hide the create topic floating button on the bottom.
This update also adds the last visited topic indicator to the topic list.