Hi,
for creating my sql databases I use the designer from Lightswitch.
It is really easy to use.
Maybe you know a similar designer to replace Lightswitch?
Thanks.
This is what I use:
If you are familiar with the visual design you can use the Database Diagrams in the same tool that @enchev mentioned.
PS. I am also one of those who miss MS Lightswithc. Especially the screen design 
But I can say Radzen is the much close experience ever I used.
This is the menu
This is the design screen.
Azure Data Studio is a newish cross plat app for SQL Server database design and management.
It's like ADS is to SSMS as VSCode is to Visual Studio.
I use this: https://dbeaver.io - it is cross platform and supports a wide variety of databases (basically everything that Radzen Blazor Studio supports).
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Another reason I like Azure Data Studio is the Database Projects Extension which has all the features of SSDT in VS (Workspaces, Projects, Import\Export DACPAC, Schema Compare, etc). That together with integrated git SCM like VSCode (ADS is built on VSCode) and finally free & easy source control and deployment for databases.