That doesn’t show up in my version of the app on a Samsung android 15 phone, BUT there is a share icon that will take you to the observation on the website and it shows all the projects that it’s included in.
Note: other manufacturer’s phone may be different.
This is what I see if I open an observation without editing. If you scroll down it says “Included in 6 projects” for this particular observation, then when I tapped that it opened a screen that shows the projects the observation is part of.
I think there may be a difference depending on whether it is a traditional or collection project. For example, my observaation of an Alkali Bluet, according to @merylgreen 's method, is "included in one project:
When following the link from the app, it shows the project Blue! but not the project LGBTQ+ Naturalists. The difference is that Blue! is a traditional project where every observation has to be added manually, whereas LGBTQ+ Naturalists automatically includes all observation made by project members.
That is confusing… I went and checked the observation I used as an example above and the number of projects matched. I found another that shows it is part of 1 project in the app and part of 4 when I viewed the same one on the website. I also noticed some observations that do not show they’re part of any projects in the app (the button does not show in this case) but they are part of several projects on the website.