Presumably you're talking about the Microsoft PowerToys SVG add-in?
Opus can use the same preview component as File Explorer (and it normally does by default).
Please try going to Settings / Preferences / Viewer / Plugins and click the ActiveX + Preview + Office + Web item in the list. Then click Configure.
In the window that opens, check that Svg is listed under Preview Handlers, and that it's turned on and has the file extension .svg assigned to it.
You may need to turn it on or assign the .svg extension to it manually if it's not already.
In the preview pane you can check that the Svg add-in component is being used by seeing what is said in the title bar:
If the preview component isn't being used, it will most probably say Internet Explorer:
