These features can be enabled or disabled in the preferences window.
Add beautiful math formulas to your markdown documents using KaTeX:
Mathematic formulas can be written, in the syntax of the LaTeX language, between two $$
tags.
Math fomulas rendered by KaTeX.
Create line graphs, bar graphs, or scatter plots in your documents using Charter.
Graph rendering using Charter.
More informations here.
Create flowcharts or diagrams in your markdown documents using Mermaid
More informations here.