In Gutenberg 3.6.2, the development team moved the Convert Block option to the left most icon in the toolbar. As long as the toolbar is visible, so is the option to change block types. However, there are a few user experience issues with this approach.
The first is obvious. The paragraph block icon looks like an alignment option. The second issue is that the icon represents the current block being edited, sort of like a block label. Unless a user hovers their cursor over the icon, it’s difficult to realize that it’s for changing block types.
Hoffman suggests changing the icon to a drop-down menu, similar to the one in the Classic Editor. The menu would make the ability to change block types more discoverable. It removes confusion associated with icons and is a workflow that’s already established.
Gutenberg developer Joen Asmussen thanked Hoffman for the feedback and listed a number of things to consider with his approach. These include the editor’s need to be responsive, scale to editors with thin columns, accessibility, and accommodating long block names.
Gutenberg technical lead Matías Ventura also commented on the proposal.
Just wanted to say thanks for all the constructive voices here and willingness to find better solutions. If there’s anything that is fairly clear is that the current ‘block switching’ interaction is not as obvious as it could be.
I think using the paragraph icon instead of the one that is easily confused as alignment, @jasmussen‘s update in #9310, plus the addition of the drop-down arrow are a good baseline to check on the next release and see if we need something more involved. @kevinwhoffman it’d be great to expand on your proposal and see how it might look across more blocks and nested contexts.
Depending on your workflow, changing block types will be a common action. For example, I often press enter at the end of a paragraph block which creates a new paragraph block automatically. Being able to easily identify and use the change block type option will improve my writing experience.
Those with feedback on Hoffman’s proposal are encouraged to respond to the issue on GitHub. It’s also worth noting that the team is experimenting with using an icon that’s designated specifically for changing block types.
Source: WP Tavern