This is a premium feature available with Astra Pro Addon plugin. To use these Pro features, you need to have the Astra theme along with the Astra Pro Addon installed on your website.
You can manage the spacing using the Spacing module available with Astra Pro. Please refer document, to begin with, Spacing module.
This will allow you to add spacing around site identities like Logo, Site Title & Tagline.
You can find settings under Appearance > Customize > Header > Site Identity.
If you want to know more about Site Identities please visit here.