Has anyone seen this issue? On certain GTK3 apps, the window decorations are huge! I can’t seem to find any reason for this. On Pamac, it goes away as soon as your start searching.
But it is not just Pamac, Control panel Applets bottom menu also does the same thing?
None of this occurs with my main driver, manjaro.
Neither does it occur with your spin on KVM. edit.
Neither does it occur with endeavour and cathy on RAW nvme with cinnamon.
The usual suspects are third-party themes that have not been updated for recent upstream changes. 
I tried switching everything to Mint-L but it is still there… I will keep looking.
I am speculating if this could be some wayland related interaction.
I mean - only a few days ago another member @Edward78 had a similar issue on Plasma.
The member is known to do a lot of customising - I don’t know what came of it - I initially thought it was a new customisation conflict - but when your topic came up - I thought of the resemblance.
I decided to spin up a vm (4GB RAM, 4cpu and 32 GB diks) - during installation I hovered the icons - and saw zen browser - thinking - hmm - how do that look.
I totally slowed the system to a crawl after the first introduction screens.
Switching to a TTY - took more than 10s to switch - pulling up htop - filter on zen - the htop was filled with zen processes - no wonder it crawled - I decided to reset the vm and purge the disk for another try.
That may just be me - expectation et.al. - I have the community Cinnamon spin (team maintainer) on 24G disk with 4G ram and 2vcpu - it runs quite differently.
Perhaps it has something to do with Wayland?
@linux-aarhus I tried switching to wayland but same issue. I installed pamac-gtk and no issue there. But on the Applet control panel, the update menu at the bottom, still has the issue.
I am going to install a VM from base DeLinuxCo and standard Cinnamon install and see what happens after running the updates.
My default VM for my ISO runs perfect with 4 cores, 4 GB memory and 25GB drive, no issues at all. Smooth as silk.
I guess it was my own doing - impatient or similar … I don’t think it is the ISO … so don’t take this as me being critical - I am not - I was just confused when it happened and I was commenting at the wrong thread 
/EDIT
Did a new install - using vmware-workstation - your ISO behaves as expected - no huge decorations OOB.
Then I do a full system sync … will be back tomorrow
Rebooted - couldn’t wait - gtk3 settings is off - just like you experience.
I managed to get it back on track using the themes applet - use simplified setting and switch to Mint-L - Appearance - Dark - any color of choice - I like orange …
pamac is so much off using gtk3 - I switched it to gtk4 which normalised the pamac.
The only gtk3 app I tested was pamac - I didn’t play around with it much - I launched GIMP - looks OK at first glance.
I just installed your SPIN on NVMe (not KVM). I noticed the symptom. I overlooked one character, “3”. It was reproducible.
When I installed pamac-gtk3, it took cinnamon-settings and other things down with it and turned them into giant dinosaurs. I’ve never liked the pamac-gtk UX after all these years, but I was a bit surprised. As I said before, this doesn’t happen on the Manjaro Cinnamon I use regularly.
I haven’t seen it, but it was mentioned once or twice recently. My assumption was that it was theming related, and I didn’t look any deeper.
I think the issue is non-maintained icon sets. I have encountered that before. Some icons just balloon to huge sizes. You appear to be using Moka or Paper from what I can see, and I think they might not are not maintained anymore.
Test by using the default icon set that came with Manjaro and see if the same issue recurs. If not, I think that’s your answer.
Thanks guys, I have been buried at work and have not had time to look deeper into this and sure enough, it is the Icon set “Mint-L”, I switched it to the Obsidian-Sand_SemiLight and the issue is gone.
I wonder if the Mint team knows about it?
I love this community!
Update: I posted it on the Mint-L github Issues.
thank you !! Mint-L theme.
Glad the problem is solved, though it’s kind of weird that you marked your own post as the solution. 
That Mint icon set is based on Paper and Moka, by the way.
It felt weird… and satisfying at the same time. 
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