Mobile devices allow creating and editing simple projects. This kind of project supports one sensor and one actuator.
Still, there might be a solution to get an advanced project editor on a tablet.
Some tablet models enable you to create advanced projects with these settings: Change the tablet view to landscape view, you can set the 'desktop view' in your browser and connect a mouse.
For creating and edition advanced projects we recommend to use a desktop PC or a laptop. You can also extend the projects which have been created in the simple project editor by opening them in the advanced project editor on your desktop PC.