Hey greenPlatypus -
Free trials only offer serverless/SQL compute clusters (due to resource and cost controls). Standard or Premium tiers provide all-purpose compute clusters, and the Premium tier is recommended for full features and future proofing.
It is a bit confusing, but the Premium label in your subscription reflects the trial tier, not a paid subscription yet. Paid subscription + sufficient cloud quota are needed for all-purpose clusters.You can create all-purpose clusters after upgrading from free trial.