Macron's current parliamentary majority is not composed only of his party, La République en Marche. Several other allied parties have a "group" (and the attached public financing) in Parliament :
From right to left :

• Agir (former Républicains),
  
• le Parti Radical (the residual right wing of the 19th century progressive party)
  
• Horizons, party of Edouard Philippe (ex Républicains)
  
• A bunch of other Républicains who defected after the recent Presidential elections, and will be planning on keeping their seats in Parliament
  
• LRM
  
• MoDem, François Bayrou's party
  
• Mouvement Territoires de progrès, former PS rats
  
• Parti écologiste En commun of Barbara Pompili (Green traitress)
  
• Le fondation républicaine, Jean-Pierre Chevènement (who inexplicably is not yet dead).

Unlike the left, they will slug it out in some arbitrary and opaque process to allocate the winnable seats.

On the far right : Several of Le Pen's lieutenants defected to Zemmour. She is insisting that there will be no arrangements with his party for the legislative elections; this is suicidal, so I hope she sticks to her guns.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}