Yes any plant can burn some of the ' full sun' succulents may show signs of heat stress and enter into a heat dormant state. A younger plant will often burn much faster under the same environmental sun conditions as it's older counter part.

Sigh now two more (including one of my favorites) look like they got sunburnt. This one had a lot of leaves that turned sort of translucent colored, not mushy, but fell off quite easily when touched/tugged a little bit. This is the plant now after all of the sunburnt looking leaves fell off

And my favorite, the babies were more greenish but now look white!

All of my plants are currently in this

Oh. Well. That explains it. I think your succulents are suffering from fatal terrarium syndrome. Even if you keep that thing open, it will still be so stuffy in there, most succulents will melt.

Pagan

Dammit. I just feel bad because it was given to me as a gift but at least I can still use the racks and then put the top on when it storms.

Do you know if the plants can recover? Eventually at least?

That looks like problems caused by a combination of a lot of sun and too much heat. On a day with no breeze the mini greenhouse will become an oven. The greenhouses that have plants in them during the hotter months of the year have equipment like cooling fans, automatic vents, shade cloths, and evaporation cooling. The mini greenhouse you have might work for starting plants early in the growing season and might protect against light frosts. It isn't meant for plants placed in full sun during June. The Kalanchoe will be OK. I'm not sure the Haworthia will survive. If you try other plants in the mini greenhouse then maybe move it to a place where it will be shaded during the hotter part of the day.

Pagan and polypompholyx, thank you so much! I really appreciate all of the advice.

Just one more question please-the haworthia with the babies that are looking a little white, should I just let it be or does the mother plant have a better chance at recovering if I cut off the babies?

That hasn't happened to one of my Haws so I can't give advice based on experience. However, probably best to disturb the plant as little as possible right now so leave the pups attached. Looks like the whole plant is in the same condition and I can't think of a way the main plant would benefit if the pups were removed. If the leaves can't recover but the stems are OK then new green leaves might grow from the stems.

AS

Sorry this happened, hope they recover. How sunny is it where the GH sits?

Plastic enclosed space gets really hot inside; just like leaving kids or pets in the car...Not lecturing you, things happen. But plants need good air circulation too. For protection from rain, the 'roof' part should be enough with all sides rolled up.

Thank you again polypompholyx.

Rina, thanks, it's ok, I tend to learn lessons best when I make a mistake! I kept them all inside last summer so this is my first time putting them outside.

It is on the sunniest part of the deck. I'm not even that worried about rain because they are all planted in pumice, just storms that will get super windy but I think I can just put back the plastic at times like that.

Thank you for your reply!

I'm glad I asked these questions on here when I did