Some items like the Mining Rods have a pretty annoying screenshake in Forager, especially when you have 10+ Mining Rods active in the game. There are no possibilities for turning of the screenshake in the menu, but there is actually a method to getting rid of the screenshake in Forager.
What you need to do is to locate a file called "secretOptions.ini" and look for "screenShake="1"". Change this to screenShake="0", and save this file. After this you won't ever see any screenshake when playing Forager again.
The secretOptions.ini can be found in your AppData folder, typically found somewhere along the following place: "C:\Users\Username\AppData\Local\Forager". The AppData folder tend to be hidden, so go to Windows options and turn on hidden folders to see it if you can't find it.
And that's all you need to do to turn off screenshake in Forager. If you ever want it back on, do the exact same thing, but change 0 back to 1 again in the secretOptions.ini file.