I was hoping to try a new idea for a Custom Object, but the nice big orange button "Create Custom Object" (that I see in my production account) is not visible in the sandbox.
Hey, @PBaxter👋 To clarify for anyone else that might search for the same info, for HubSpot Sandbox Accounts you need to re-opt-in to any betas that were previously opted in on your production accounts. You'll need to be a Super Admin, or have a Super Admin in your portal, re-add the beta to your Sandbox Account.
Beta and trial features are not synced from your main account. You need to enroll a sandbox account in a beta in order to use those features.
To opt in to this beta, here are the steps. You'll need to look for the “Manage and Visualize Your Data Model” under the Early Access section of Product Updates:
Select Product updates from the dropdown menu
Select Early Access > Betas
Select Manage and Visualize Your Data Model
In summary, Sandbox Accounts have to re-opt-in to any betas the production account is already a part of.