it doesn’t look like there’s a normal user interface in the batch edit screen to get observations by project. however, you can filter this way by editing the URL.
but first, you need the numeric ID of the project you’re interested in. assuming this project: https://www.inaturalist.org/projects/leti-s-donnerschwee-garden-project, you can get the numeric ID (206389) from https://www.inaturalist.org/projects/leti-s-donnerschwee-garden-project.json.
so then to filter for your observations in that project in the batch edit screen, you would use: https://www.inaturalist.org/observations/letiziaw?project=206389. (note that the parameter is project rather than project_id because the page is very old and uses naming conventions that are no longer used in pages using a more recent design.)
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alternatively, you can filter for any set of observations using the methods described in:
- https://forum.inaturalist.org/t/search-by-location-accuracy-under-edit-observations-batch-edit/21399/5
- https://forum.inaturalist.org/t/batch-updating-location-accuracy/11421
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that all said, you should realize that iNaturalist’s obscuration feature does not completely protect the underlying coordinates recorded in any observation. so even if you use the obscure feature, if it is super important that randos are not able to locate your garden, then i would place the center of your observation at some public place a comfortable distance away but preferrably in your same county / district (such as the intersection of two major roads), and then set the accuracy value to something large enough that encompasses that public place your private place, plus some padding.