I have enable the not found option in my 404 page but still my project does not directing to the 404 page. it directs to an empty page. is 404 page option having any issue ?
log out first. or try incognito mode.
@petrbilek Thank you it works in incognito mode but not in normal mode. i tried login out but it did not make any change
Hi, when you are logged in, you are not able to see 404 page or sitemap.xml page. We will work on this in future, but for now, please use incognito in order to view those two pages. 
Alright thank you so much