I’ve created a new layer on Part Entry and I just noticed that the delete option is missing from the meatball menu. I do not recall touching the tools at all and in comparing the layers, I do not see a delete tool, regardless.
There is a known bug with the application studio where a binding on the page will go missing. Check your bindings and make sure they are bound to the correct dataset on that page. Open the base layer and check the bindings and then compare against your layer.
The effect this has is it will cause tools to go missing with no explanation.