You can choose which categories in the left sidebar should open or collapse by default.

Collapse one category

1) To collapse a category, click the ... next to the category name in the sidebar.

2) Choose Collapse by default

3) In view mode, this category will now be closed by default.

Collapse all categories

1) To collapse all categories, click the ... next to a category name in the sidebar

2) Hold Option on Mac / Alt on Windows

3) Toggle the Collapse by default option

4) All categories will be closed by default