Regarding pre open session

I was looking at a stock yesterday during pre open and saw that the volume was increasing between 9:00 and 9:07. I had read that this time period is only for order placing, modification and cancellation and no trades take place during this time. Trades take place at equilibrium price after 9:08. PFA the screenshots and see that the volume is increasing and then the volume decreases. Pls clarify. Also, why is 20 market depth not available in this session.

Is that screenshot from the listing day of clean science ?

20 deep depth should be avl. What error you get when you try?

I can see 20 market depth. (but now the markets are closed)

What error does it show for you ? When you click that ‘Show 20 depth’ ?

Its from monday.