Hi Anas,
In ArcPad Studio there is not a way to automatically limit a page of a form to a certain amount of fields but you can open the edit form from the apl and re-arrange the way the fields are placed on any of the pages and, if needed, add new pages at the end to accommodate any overflow you may have.
Once you have everything placed the way it should look on the device, you can now apply this modified form for future checkouts by checking the Layer Definition Template check box in the ArcPad Data Manager. That way you do not have to modify the form each time you check data out to the field.
Thanks,
