You can use sessions to save your Tabs, Bookmarks and Layout in the current state so you can open them afterwards. To save a session, you go to Sessions > Save or Save as...

You can also choose to open a session at startup. You can enable this function by going to Sessions > Properties... and clicking the checkbox next to "Load this session on startup".

When you go to Sessions > Save as... you can choose the parts of the session you want to save by clicking the checkbox next to them. The given options are Tabs, Bookmarks and Layouts. Currently, you can only choose whether or not to save tabs.