I have a problem with "fix position" not showing

hello, i have a problem with “fix position”. i was using figma normally and i needed to fix a nav bar but i could find the “fix position when scrolling” check box, so i rechead an old project of mine that has a nav bar fixed and for my surprise, the “fix position when scrolling” was not showing in this project either… as can u guys see, i have 2 layers fixed, but i cant unfixed them bc doesnt show it to me. can someone help me pls??