EDIT by @jancborchardt, todo for grid view:

Breakdown of steps for grid view

Essential

• HTML structure: Current table structure makes it difficult to change the CSS. We need to change to a div-based layout. Only changing table elements to divs, not changing any look or functionality!
• CSS: Introduce grid view style and hook the switch on the top right to switch between the views

Non-essential

• HTML: Simplify structure as there are probably a few elements to cut. Keep in mind what we need for Vue.js, and for standardization across apps
• Documentation: Document the structure for the new list view and grid view. Put them into the currently empty "Main content": https://docs.nextcloud.com/server/14/developer_manual/design/content.html
• Vue.js: Switch Files app to Vue.js part by part. (Is becoming standard for apps, more maintainable, enables us to use animations easier, etc.)

The essential parts we have to do for Nextcloud 15, and considering the short time-frame we should really focus on that before doing the non-essentials.

(Original post by @maprambo)

When pressing that button, the gallery opens. It would make much more sense to show all the files and folders as symbols, like native file browsers do:

Don't get me wrong - I love the gallery and also that button. But it leads to confusion, so a real symbol view should be opened. The gallery button could just get the gallery's app icon.