I am new to QGIS and I am trying to make a map of India displaying some values. I want to have a legend, and I customised the legend in layers panel, the Layers panel clearly displays my legend. But the issue is when I try to make a map with that, legend displays no symbols, only values are displayed with the legend. I am adding the screenshot of my Layers panel showing the symbols and layout map without the symbols. I am using QGIS version 3.18.1.
Layers panel showing symbols:
Layout map legend without symbols: