Have you tried 'Personal Vault' in Microsoft OneDrive?I've messed around with other free/paid encryption software such as Axcrypt, FolderLock, and VeraCrypt. None of them are as easy to use as the AV versions.
Free version is limited to 3 documents. Included with Microsoft 365 for Consumers subscription.
Personal Vault in OneDrive protects your sensitive files with identity verification. Keep your important files secured in OneDrive cloud storage