You can get around this by setting up individual app limits, and from there categories, for yourself. Go to the screen time section of the settings app, then tap the name of the device you want to set the limit on. From there, you can scroll down to the most used, and click on an app you'd like to limit (for example, Instagram). Scroll to the bottom, and tap "Add a limit". Once you've done that, the app will appear in your list of limits for that device.
If you'd like a group of apps to collectively share the same time limit (for example, 1 hour per day on Instagram, Facebook, Twitter, and Snapchat together), you can do that too! If in the previous step you added a limit to Instagram, you can click on "Instagram" in the limits section, then tap "Edit apps". From there, you can add whichever other apps you want limited in that category.
(My phone is in French right now so the English version of the things toi click might be slightly different, but it should be similar enough)