Hi @lucio b thanks for posting in the community! That's a great question while it is possible to add page tabs in Lucidchart that function is unfortunately not available in Lucidspark. However it is possible to create breakout boards which can create a similar effect as separate pages within a board. 

Would you mind clarifying what tabs you are referring to in Lucidspark? If you are referring to Lucidchart looks like someone from our team has already answered your question in this community post here!

Hope this helps! Feel free to let us know if you have any questions about these features thank you!