When the focus picker strategy is turned on you get this prompt every day:

Clicking on the "Pick Projects" button allows you to select the projects you want to focus on today from a list of all your projects:

To pick a project, just click on it to highlight it.

You can enable this strategy by going to ☰ → Features/Strategies → Focus Picker.

You can filter this list on the top right to make it easier to find the project you want to focus on today.

The selected projects will show at the top of your day. 

Clicking them takes you straight to the project fullscreen overlay where you can work on the project in a focused way.
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You can hide/show them via the project flag icon that you can find in the hover menu on the far right. If you are not seeing the project shortcuts in your day view they are likely toggled off.

If you've accidentally dismissed the "Pick Focus" button, you can bring it back by clicking on this button in the vertical menu:

You can also use _unhideFocusPicker secret command to do the same.

In strategy settings you can choose whether you'll see only projects, categories, or both in the list of items you can focus on.

When you go to ☰ → Settings → Tasks & Projects you will find an option called "Select how projects should look by default" where you can change the way progress is displayed and choose if you'd like to see the priority stars, due date, etc.

The only difference between these two strategies is that Project Shortcuts will display the same projects each day, unlike Project Focus Picker that will ask you each day which projects you want to work on that day. You can use both strategies at the same time if you wish so.