Trapped particles in hollow-core fibers enable long-range sensing, though advanced control of their in-fiber motion, such as multimodal cooling and squeezing, remains challenging. Here, we present optical interference-based techniques for controlling a fringe-trapped silica nanoparticle inside a fiber. After feedback-cooling its axial and radial motion, we induce axial delocalization (position anti-squeezing) via two approaches. First, non-adiabatic fringe suppression expands position variance by 11.83 (±0.7) dB to that of the initial cold-state while retaining Gaussian statistics. Second, multi-pass particle positioning at dark fringes increases delocalization to 13.23 (±0.5) dB relative to the cold-state's variance via inverted potentials, in agreement with stochastic theory. Stronger delocalization produces non-Gaussian states. Our results demonstrate fringe-trapped particles in hollow-core fibers as a versatile platform for long-range sensing and macroscopic quantum physics.