Dark exciton condensates offer a long-lived platform, yet controlling their density and spatial profile remains a central challenge. We develop a spatially resolved selectivity framework for driven-dissipative bright-dark condensates controlled by the bright-dark detuning ${\mathrm{\Delta }}_{\text{bd}}$. Within an open-condensate Gross-Pitaevskii framework with effective bright-branch injection and detailed-balance-consistent spin-flip rates, stationarity imposes a universal overlap-renormalized conversion constraint on the dark fraction, rather than on the bare population ratio alone. In the long-lived dark-branch regime this constraint reduces to $\mathcal{Q}\simeq exp({\mathrm{\Delta }}_{bd}/k_{B}T)$, while the bright component remains largely buffered by pump and radiative loss. Confinement then determines how the same constraint is realized in real space: soft traps yield ringlike dark accumulation, whereas hard-wall confinement produces boundary layers, radial quantization, and boundary-sensitive annular interfaces under weak pumping, with the corresponding radial branches dynamically selected or destabilized by the pump aperture. The extracted selectivity collapses across top-hat and Gaussian pumps, establishing a compact route to spatially resolved, dark-selective nonequilibrium regimes in van der Waals heterostructures.

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• Excitons
• 2-dimensional systems
• Bose-Einstein condensates
• Non-Hermitian systems
• van der Waals systems