There are two ways of doing that, you can set the min/max zoom to the current zoom, or use ContextActionService to bind a function that if returns Enum.ContextActionResult.Sink will prevent roblox from scrolling and if return Enum.ContextActionResult.Pass will allow roblox to zoom-in/out.
local ContextActionService = game:GetService("ContextActionService")
local DisableScroll = true
ContextActionService:BindAction("DisableScroll",
function ()
return DisableScroll and Enum.ContextActionResult.Sink or Enum.ContextActionResult.Pass
end, false, Enum.UserInputType.MouseWheel)
Sorry for any typo, Im on phone lol