There is a blinking cursor indicating active fields, but I can’t type into them. The cursor doesn’t move. It seems to be read only, but there isn’t anything to read (new database).
Insufficient information to be able to give you an answer. Which version of LO ? How did you create the database, which db engine are you using ? Do you have primary keys in your table that is referenced by the form ? Primary keys are a requirement for each table in LO Base that you create in order to be able to write data to them.