I'm trying to change a world map CRS to create a nicer looking map. No matter what CRS I choose it always looks similar. I've tried changing the project CRS as well as the layer CRS. This is all with a shapefile downloaded from here
I had it working for a bit then I got the qgis exception error 'fallback transform failed'.
I'm using QGIS 3.16.16
This is with both project and layers as World_Robinson ESRI:54030. Definitely not how it's supposed to look.

Live update, see https://gis.stackexchange.com/a/392993/88814 If it still doesn't work, you should provide more information. Also try to save the project and restart QGIS. – Babel Nov 04 '22 at 23:21