Scales to Play Over Bmaj7#11
Every chord is a subset of several scales: any scale that contains all of a chord's tones fits over it. Pick a chord to see the matching scales from its own root, the major keys the chord belongs to, and full fretboard diagrams for every scale on guitar.
A Bmaj7#11 chord contains the notes B – D# – F – A#. Any scale that includes every one of those 4 tones fits over it — from the root B, that means B Lydian and B Persian. Start with the first scale listed: it is the most common choice, and the others color the same chord tones differently.
Bmaj7#11 is also diatonic to one major key: F# major (relative minor D#m). In a song from one of those keys you can also solo with the key's own major scale or its relative minor pentatonic across the whole progression, not just this chord.