Levels of use
MathGraph32 can run under four predefined levels :
On the first start of MathGraph32, the level in use is advanced with complex numbers.
To change the level of use, use menu item Options - Preferences et select the chosen level.
The available tools are adapted to the chosen level.
To change the level of use, use icon 
on the top toolbar and select one of the four predefined levels.
Check the checkbox Use this choice for next start and validate.
The chosen level will be active for next start.
Use icon of the top toolbar.
To filter the available tools, select on of the four predefined levels.
Check the checkbox Personalize available tools. A new button Tools choice appears.Click on this button.
A dialog box pops up. Choose the tools you want to allow or forbid.
Check Use this choice for next start if you want this choice to be memorized.
You can also use an already created figure (in which a tools choice has already be done) as base for the tools choice by clicking on button Tools choice from figure. Then you have to browse to the directory containing this figure, select the then click on button Open. Then you can modify the tools forbidden or allowed.
Use icon of the top toolbar.
To filter the available tools, select on of the four predefined levels.
Check the checkbox Personalize available tools. A new button Tools choice appears.Click on this button.
A dialog box pops up. Choose the tools you want to allow or forbid and validate.
The tools available in the left toolbar are now the chosen tools.
If you save your figure, these tools will be the available tools when opening next the figure.