Quest mark on my workshop in the "Molecular Level" [duplicate]

If a settlement workshop is highlighted as a quest objective, that usually means you either need to build something in a settlement in build mode or retrieve an item from the workshop.

In your case, it sounds like you need to power up the interceptor. Try building a power-generating structure, then connecting a piece of wire between it and the interceptor.

• Open "build mode" in your settlement.
• Go to "Power" > "Generators", select an option from the list, and place it near your interceptor.
• Hover over the power generator. In the toolbar at the bottom of the screen, there should be an option to press a button to "attach wire" (space on PC, Y on XBox One).
• Next, hover over the interceptor and press the same button to connect the other end of the wire to the interceptor.

Here's a video tutorial that teaches you the basics of power: