You can use the[i][color=#1e84cc] [url=https://wiki.geogebra.orgen/Navigation_Bar]Navigation Bar[/url][/color][/i] (on the bottom) to follow step by step. In this case is recommended to show the objects behind the construction. Use the[icon]https://www.geogebra.org/images/ggb/toolbar/mode_showhideobject.png[/icon] [i][color=#1e84cc][url=https://wiki.geogebra.orgen/Show_/_Hide_Object_Tool]Show/Hide Object[/url][/color][/i] tool (in the last icon) for this. To refresh to original construction just press on the cyclic arrows in the right top corner.