You might notice that new wrappers and blocks show without an ID next to them in Grid and Design Mode. That is because we switched to a different way of assigning IDs (UUID) that makes them completely unique but also very long (but much more stable). Instead of identifying your wrappers and blocks by those IDs, assigning aliases is very important in 3.7 to keep track of which blocks and wrappers are which.
To make it easier for you, we’ve made setting the alias available in the right click menu.
And of course, you can still add aliases in the config options of the block or wrapper too!