If you are using Power Apps customized SharePoint online list form in modern experience, try this:
Add two button control on your list form.
Set button text of first button control to Save and set it's OnSelect property to:
SubmitForm(Form1)
Where Form1 is the name of your form control connected to SharePoint list.
- Set button text of second button control to
Save and Submit and set it's OnSelect property to:
SubmitForm(Form1); FlowName.Run()
Where FlowName is the name of your Power Automate flow added to Power Apps customized list form.
Read more information at: Create a canvas app that can trigger a Power Automate flow