New Button for quick create is not appearing - cloud application studio

Dear Team,

I created a custom BO and generated screens based on that. in the OWL screen I added a new button in the tool bar. when I preview the screen new button is coming. then i changed the property Design semantic to quick create, then save and activate. new button is not coming. if i changed semantic to none then new button is appearing.

Can you please help how we can fix this issue.

i am following steps in this video

https://www.youtube.com/watch?v=ygnXwUZpBWY&list=PLAN4lvL4kFnh45xtdaBbDbxVLfITqQixH∈dex=12