The Canvas Apps will have the Command bar below by default, and Microsoft has released a Preview feature to enable the Modern Command bar.
Follow the below steps to enable the Modern Command bar experience feature in the Canvas Apps.
Prerequisite
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Step 1. Create a New Canvas App or Open an existing Canvas App.
Step 2. Click on Settings.
Step 3. Click on Upcoming features.
Step 4. Under Preview, click on Enable modern command bar to set to On to enable the new command bar experience in the canvas apps.
The modern command bar will be shown instantly on the Canvas App.
I hope you have enabled the Modern Command Bar feature in the Canvas App.
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