Logically, a single slur is enough for two notes, or for a chord. This is what Elaine Gould in Behind Bars says, and with an illustration p. 114: "All notes on one stem take a single slur, and not a slur to each note"
But in real life (of some instruments, I think of the guitar in particular - I don't know if it's your use case), there are technics of left hand (we could call it a "double Hammer") which require to show two slurs - I talk also about published scores - for a good understanding of this.
So (if you are in the same voice, as I presume?): select the first note -> S -> X (for flip)
Then re-select the first note -> S: but without X this time.
You will get both slurs.
Comments
https://musescore.org/en/handbook/slur#second-method ?
In reply to https://musescore.org/en/hand by Shoichi
Logically, a single slur is enough for two notes, or for a chord. This is what Elaine Gould in Behind Bars says, and with an illustration p. 114: "All notes on one stem take a single slur, and not a slur to each note"
But in real life (of some instruments, I think of the guitar in particular - I don't know if it's your use case), there are technics of left hand (we could call it a "double Hammer") which require to show two slurs - I talk also about published scores - for a good understanding of this.
So (if you are in the same voice, as I presume?): select the first note -> S -> X (for flip)
Then re-select the first note -> S: but without X this time.
You will get both slurs.