Well.  all the records are in a table so all you need to do is point the the other form to the same record source.

you can even copy and paste fields ..  your best bet though is that if you have active and inactive and you want to use a form for each . base your forms on a query.  you can even do the query within the form.  Then filter active as true or false but have all of the data in a table with the field.

yup query with criteria is the way to go.  but if that is not working for you please show a picture of what you are trying to do.

Please explain what you actually want to happen.

How I have handled this is to put a Yes/No field in my table called IsActive. On the form, add a checkbox, do not set the control source to anything, and under Data set Triple State to Yes. Then in your code you can filter the records so that if the checkbox is True, it will show only Active records, if it is false, it will show only inactive records, and if it is Null it will show all of the records.

Sandra 's solution works great. Just be mindful that id you move your backend to SQL Server, Yes/No fields can NOT have NULL values and this solution will not work.

The idea is that I have one form for other (future) days, and the other form for today. Because I have assigned a ride to a driver, I have to go to the other form, so today.
I know it is possible, but I don't remember how.
So when I have assigned a ride number 1 in my selection list, it has to go to the other form, after refreshing or double clicking

In the form where you assign the ride number, you could use something similiar to If IsNull(RideNumber) to show the records that have not been assigned a ride number, and in the Today form, use If Not IsNull(RideNumber) to show the records that have been assigned a ride number. Be sure to change RideNumber to the name of your field.