This is your work space. It holds your tabs. You need to create a new tab (Menu File- > New) before you can drag sensors here.
Dyma eich gweithle. Mae' n dal eich holl waithdaflenni. Mae angen i chi greu gwaithdaflen newydd (Dewislen Ffeil - > Newydd) cyn i chi allu llusgo synwyryddion yma.