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Vikas MishraVikas Mishra 

In trailhead App customization topic, I am not getting the "Object Manager" option while searching it in quick find box.

Let’s get started by defining an object-specific action. We’ll create an action so that, for example, if your users open the Acme account, they can click on your New Opportunity action. The new opportunity they create will be automatically associated with the Acme account.

First, we need to find and open the Account object.

From Setup, enter Object Manager in the Quick Find box, then click Object Manager.
Enter Account in the Object Manager search box.
Click Account to open the object and then click Buttons, Links, and Actions.

Click New Action.
Select the type of action you want to create. For this example, let’s choose the Create a Record action.

In the above trailhead guidelines, I am not getting object manager when searching in quick find box. 
Shannon Mah 3Shannon Mah 3
You'll need to enable Lightning Experience (if you're in the Classic setup, go to Lightning Experience and turn the toggle on). If that is already enabled, make sure you've switched to Lightning Experience by clicking your name on the top-right, Switch to Lightning Experience. Under Setup you should be able to find "Object Manager"