This project is called the Art Maker. The buttons on the right form the toolbar. In the toolbar, you can increase and decrease the pen size with the size +1 and the size -1, switch from drawing to erasing with the paintbrush and eraser button, and clear all your work with the clear button. Just so that you don't get confused with pen and eraser size, there is a variable to let you know what the pen AND eraser size is. The colours surrounding the pencil form the palette. Choose the colour you want. You can choose from green, yellow, red, or blue! Go on fullscreen and press the green flag to begin! Having problems with using the project? Leave a comment below or on my profile. I'll send a reply.
Credits to @akanksha_23