I just found the answer to how to resize the svg logo:
Resizing an SVG file in the code
Step 1: Open the SVG file in a text editor
An SVG file is just code. Open the file in your chosen text editor.
Step 2: Locate and edit the dimensions
Towards the top of the code, you will see the pixel dimensions to display the svg at. Change these to your desired size, remembering to keep the aspect ratio the same as the original file.
Step 3: Save your file
Step 4: Upload your file
Now you can upload the svg through your media library or through the Avada Theme Options panel.