Can Projects be grouped into folders in Photos?

No, the actual projects can't be grouped in a folder. Folders are not allowed in the Projects section.

If you want to group projects you can add a common prefix, i.e. 2zx- or just 1- or 2-, to those you want to group and sort the projects by title.

As brbo indicated "project" in Photos has a specific meaning, referring to the "File>Create" menu item:

File>Create>Slideshow creates a SlideShow project. Those projects are listed

at the very bottom of the Sidebar. Those Projects can't be put into albums or folders.

As to pictures in albums and folders, you can see this:

Organizing Photos with Folders & Albums - Apple Community

Let us know if you need some clarification.

Re: "Can Projects be grouped into folders in Photos.

I have numerous projects."

If the projects are "albums" (folders of photos or images), yes they can be grouped into other folders.

If the projects already have multiple albums (folders of photos or images) within them, yes, they can go into other folders

Also: We can have more than one photo-library..

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If you are already happy with the organisation of your individual photos, in albums of photos, in folders of albums, and in folders of folders, the above "yes" may be all you want. However, there is a "knack" to grouping folders that is not easy to impart using this method of communication.

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For organising our photos, it's often a good idea to look at the whole system. This can help ensure that what we organise today, fits into the overall plan. We generally want it to be easy to locate any specific photo or album of photos, when we want.

Apple support provides "how to" articles based on how the Photos app is set up to work.

The links below lead to articles for macOS Mojave 10.14:

• What are albums in Photos on Mac? - Apple Support

Eg says:

"An album is a collection of photos and video clips. Photos creates some albums for you, and you can create as many albums as you want to organise your photos the way you like. You can place photos in more than one album. You can also create Smart Albums, which automatically gather photos for you based on criteria you specify — such as keywords or locations. You can organise your albums by placing them in folders."

• How to: Create albums in Photos on Mac - Apple Support

• Group albums in folders in Photos on Mac - Apple Support

Eg: says:

"You can create folders to group your albums. For example, you could create a folder named “Family Photos” and put all the albums of your family events into it. You can also create folders inside other folders." (NB: Best achieved using Apple's method)

• Create Smart Albums to group photos automatically in Photos on Mac - Apple Support

Eg: says:

"A Smart Album automatically gathers and displays photos in your library that meet criteria you specify. For example, you can create a Smart Album that automatically collects any photos that have the keyword “Kids.”

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The bigger picture: more than one library.

• System Photo Library overview for Photos on Mac - Apple Support

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Useful resource: Photos User Guide for macOS Mojave

(provides the linked articles above + many more.)

Welcome to Photos on Mac - Apple Support

If you’re looking for more extensive control over photo storage and retrieval and metadata beyond what Photos app allows, I’d look for an app intended for photographers.

Thanks old toad for the prompt reply.

Projects in my case include calendars and greeting cards/birthday cards migrated from iPhoto.

I guess I knew the answer to my question but I'm just surprised since such files could be put into folders in iPhoto.

Thanks for the response.

Any app suggestions?