Compare Analysis Won't add more than 2 maps

[VladimirBorek1]

I have an old compare analysis app which compared four separate web maps.  I can no longer configure it to point to a different set of maps, and the only comparison app I can find now only supports two maps.

Is there a way to reconfigure the old app, or configure the new app to support four different maps?

[BernSzukalski]

The old Compare app is still available, though now considered a legacy app:

https://www.arcgis.com/home/item.html?id=a35a934152dc44dda8d793a2303f0df1

The newer compare/swipe apps are listed and discussed in this blog article:

https://www.esri.com/arcgis-blog/products/arcgis-online/mapping/swipe-compare-apps/

In practice, adding a lot of maps to a comparison limits the visibility/exploration of those on all but the largest monitors/devices.

An alternative you might consider is using Experience Builder to create the comparison experience you like. The basic 2 map comparison using ExB is discussed and shown in the blog article above.