Scales to Play Over C#maj7#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 C#maj7#11 chord contains the notes C# – F – G – C. Any scale that includes every one of those 4 tones fits over it — from the root C#, that means C# Lydian and C# Persian. Start with the first scale listed: it is the most common choice, and the others color the same chord tones differently.
C#maj7#11 is also diatonic to one major key: G# major (relative minor Fm). 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.