Hi how can i see the no fly signal after I scuba dive?
If you reffer to the MK1 watch, then you can find the information in the user manual for that watch:
On other Garmin devices, there is no N₂ saturation / decompression calculation, hence also no No-Fly indicator.
I guess you answered your question already - if you created the watch face w/o the no-fly field, it won't be there. Add it to your custom watchface.
As a side note: please post any questions regarding the MK1 watch to the MK1 forum, not here on the GCM Android forum. You will get advised much better there than here, because close to 100% visitors of this forum has absolutely no experience with the MK1 watch.