The editor menu that comes up when you click “Add New” in the content browser, or right click inside the content browser, doesn’t remain open as I try to select the upper entries on OSX in 4.18 Preview (1 and 2). I can navigate through the “Create Advanced Asset” section at the bottom without a problem, but as soon as my cursor goes above that section from below, the menu closes. If I move the cursor out to the left, avoiding the spot where “Create Advanced Assets” meets “Particle System”, then I can reach those upper icons without the menu closing.
This is still happening in Preview 3
This is resolved in 4.18 Preview 4