Graph type may be switched by going to the settings Clicking on a graph expands/shrinks it.
This displays graphs seperately per country.
This displays all countries on one graph.
This displays a single graph with aggregate data.
The heatmap values can be changed by changing the current tab. The heatmap can be cleared of selection by clicking the button in the bottom left corner of the map.
When the vaccinations stat tab is selected, the stat that the heatmap shows can be changed via the "stat for vaccinations heat map" selection area in the settings menu. You can choose from SIA, MCV1, and MCV2 to be to be shown by clicking the radio buttion to the left of your choice.