As I’m seeing this at the top of the google results for my issue almost three years later seems to indicate that the issue was still not resolved.
Is installing Dolphin the only possibility? It’s like 120 additional packages and 500MB on my system, so not really an attractive option.
Welcome to the Manjaro community @BSDgeek
I moved your post to a new topic as the forum has rules about “Necro-Bumping” old topics.
However I realised afterwards that, according to your user profile, you are not a Manjaro user, so not much in the way of support may be offered by the volunteers here.
I assume that you are using a version of BSD. Have you considered posting a support request in the Window Managers section of The FreeBSD Forums?
There is also the official support forum for PCManFM at: PCManFM - LXDE Forums
I installed pcmanfm in my Xfce4 VM to see it for myself.
It is a GTK2 based program - and this toolkit needed to be installed as well in order to have pcmanfm.
Not much different from your hypothetical Dolphin install, which would require QT and a lot of plasma components.
Dolphin is not a good fit for an otherwise GTK only environment.
I was also surprised of the optical similarity between pcmanfm and the standard for Xfce4: Thunar
They look the same.
I don’t know whether they differ much in functionality.
Isn’t using Thunar - which you already have - good enough?
There is a Qt version too - pcmanfm-qt - on plasma it will use the system wide font setting.
It is possible that using it in hyprland may require additional attention.
The settings is stored on ~/.config/pcmanfm-qt/default/settings.conf and it contains a setting which does nothing - since it is the [Desktop] section I reckon it is used when displaying link text when it is used for with the --desktop argument.
Font="Noto Sans,10,-1,0,400,0,0,0,0,0,0,0,0,0,0,1"
GTK3 version is also available in repo: pcmanfm-gtk3
By the way… It seems that the LXDE project has come back to life 
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After installing pcmanfm, the font size seems fine to me.
Then again, I’m running KDE Plasma 5 on FreeBSD; perhaps that distinction makes all the difference. 
Another factor is that I use a single 1920x1080 monitor. If you use large screens. perhaps that is contributing to your experience.
Regards.
Ok, thanks for guiding me to easily solve this. I installed lxappearance and changed the font size. And it looks nice now.