Let's say you're using the specific date filter on your project list. You may not see all of your projects because this search will look for projects whose logistics start within that period.
For example, let's say I have projects A, B, and C:
Project A starts 7/15 and ends 7/20
Project B starts 7/16 and ends 7/20
Project C starts 7/10 and ends 7/20
If I search using the specific dates for 7/10-7/20 all projects will appear, because all their logistics start within that period.
If I search using the specific dates for 7/15-7/20 only projects A and B will appear, because their logistics start within that period. Project C's logistics start before.
If you'd like to see all your projects that have pickups or drop-offs within that period, you use the Google Calendar integration to see when these logistics are occurring.
Another thing you could do is add in the Logistics Start custom column. With this new column, if you expand your search dates, you'll be able to tell when specific projects are starting or finishing