Hello, I am a Roblox Modeler who is working on an upcoming game.
I imported a map from Blender to Roblox, model by model, and it turns out that the map was too small. I was wondering if there’s any way to scale up all the models at once and for it to look normal. If not I can always import it to Roblox again and put the FBX scale to 0.02 instead 0.01, but I’m trying to see if there’s a simpler way. (Sorry for the bad quality)
Select all the parts and drag it until it’s at the correct scale.
Doesn’t really work, it all looks kinda weird
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Try selecting everything and scale it using model resizer.
Maybe after resizing and then individually size unfit to scale to something desirable
There is a good amount of plugins that could help you with that. Otherwise you can do it manually by scaling the models one by one. Have fun! 
are you holding shift while dragging? They might be made to be a bit further apart but you can always just bring the islands closer by hand
group all of them into one model then scale that one model
Select everything and hold shift while scaling
If you can’t resize it to be bigger in Roblox Studio, you can maybe resize the model bigger in Blender, and export it again. 
If you want to resize it in Roblox Studio, try using the F3X Plugin.
group it and then scale it or highlight it and scale