Allegro PCB Design Common Issues
Not able to select Board Outline in Fillet
Fillet is used to apply the round corners of Board Outline. If you have used Line to draw the Board outline the procedure is straightforward as outlined here .
However, if you have used shape to draw the board outline you will not be able to select the Board Outline, when trying to apply fillet.
You will need to decompse the shape first. You can decompose the shape using shape -> decompose. Once you have decomposed the shape, you should be able to apply the fillet.
Once you have applied the fillet, you ma compose the shape again.
Here is the youtube showing the whole process.