The data in question, you can download as .geojson or shapefile: https://data.mississauga.ca/datasets/mississauga::mississauga-official-plan-2010-schedule-10-land-use-designations/explore
In the file browser I am not able to right click on it so I can add it as a layer to my project. Nothing happens and qgis freezes for a couple seconds. I can right click on the .geosjon file right above it just fine. Happens with the shapefile version of the data as well. Pic of my file browser:
Opening the shapefile in ArcGIS Pro loads just fine though. Anyone know why? The limit for QGIS I read is 2gb.