Clips joining arrows in timeline are not showing.

The marks are not showing which we see when extending a clip or joining two clips that the two clips are now joined or any further dragging will overlap or shorten the first clip.
Even when we extend a clip to cursor in the timeline and the clip auto attaches to the cursor so that we won't pass by the cursor. That action is also not happening. I am using Davinci Resolve 15 Beta 2.
Right now when I drag a clip close to the second one, then instead of just joining the first clip starts to get shortened.

Got the answer for this one by some hit and try method. Due to some reason "Snapping" turned off in Davinci Resolve. So if someone faced problem like me then you can turn it back on by going to Timeline in menu and then clicking on Snapping.