Ooohh, I see the problem. Sorry about that. I think we thought you could still read the dialog, but maybe it's too small to even read what's there?
First, close Inkscape.
Next, you need to find a file, which in Windows, is here: C:\Users\brynn\AppData\Roaming\inkscape\preferences.xml
I don't know how that translates on a Mac, but it will be in your user directory, and not where the program is installed. Or you could simply search your computer for a file called: preferences.xml
Once you find that file, open it in a text editor. Not a word processing type of editor, but a plain text editor. Or if you write any kind of code, you could use that kind of editor. If you're familiar with Windows, Notepad is good to use. Or I use Notepad++ as a code editor, for example.
Most text editors will be able to search. Search for: id="preferences" When you find it, it will look a lot like this, except the numbers in it will be different for you. (and also except for the colors, which I added for clarity)
<group
id="preferences" <<----- search for this
state="1"
panel_size="1"
panel_ratio="100"
panel_mode="1"
panel_wrap="0"
panel_border="0"
page="23"
x="206"
y="206"
w="867" <<-----change the number to something like 600 to 800
h="590" /> <<-----change the number to something like 600 to 800
When you find it, you'll need to change the numbers for: w= and h=. Change those numbers to something bigger, like maybe 800 and 600. Or maybe more?
Then Save the file. Then open Inkscape, and open the Inkscape Preferences dialog.
Did you have success?
As I said before, if you do have a hi dpi screen, most if not all of Inkscape might be too small to use. But I would think you'd already see that. So maybe it's not.