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Expand – Opens a floating dialog that contains the selected rollout and automatically folds the command panel rollout.

Re-Center – Resets the position of the floating rollout.

? – Opens up the help documents for the Liquid Preview rollout.

Read Cache for Preview | prv_read_cache – Allows to completely disable reading of cache files in order to speed up the viewport and the simulation. When cache files are not read, neither voxels and particles, nor the grid bounding box or the Cache File Content under the Simulation rollout will be shown. This way scrolling the timeline would be quick as there will be no access to hard disk or the network. If you still need to see the grid bounding box and the Cache File Content info, you could leave this option to Always, and instead disable all voxel preview options, the Mesh Preview, GPU Preview and all particle previews. The intended use for this parameter is as a last step performance optimization - once you're done tweaking your setup and you're ready to commit to a high-resolution, overnight simulation, disable the preview of cache files.

Always – Cache files are always read by the preview.
Disable During Sim – Cache files are read only when the simulation is stopped. This would speed up the simulation and is good for overnight simulations where you don't need to watch the simulation constantly.
Don't Preview Caches – Cache files are never read for the preview. They will only be read during rendering, or in case any of the Phoenix tools requires them - e.g. the Particle Shader, the Grid Texture, etc. 

Detail Reduction | prv_dwnsmp – Decreases the grid and particle detail in the preview. A value of 0 means no reduction. Increase this value if the interface starts to lag due to the simulation being very large. Note that this parameter does not affect the Mesh preview.

Auto Reduction | prv_autoreduct – Enables automatic adjustment of the Detail Reduction parameter to improve display performance. The preview detail will be reduced up to a point where the preview will display fast without blocking the interface. Note that the detail will only decrease automatically, but will not increase.

Only if Selected | show_only_sel – When enabled, the viewport preview is only drawn if the Simulator is selected.

Active View Only | prv_avonly – When enabled, only the selected viewport shows the content of the Simulator.

Show Box | showgrid – Shows the bounding box of the Simulator. The green outline is drawn based on the settings in the Grid rollout while the red outline displays the bounds of the currently loaded cache file, if it exists.

Graph Cells | gridcells – Shows a lattice with the cell sizes on the sides of the Simulator's box or the Slice Preview.

Show Mesh | showmesh – When enabled, shows the implicit surface as a mesh. This mode overrides the Voxel Preview mode. Note that if Render Mode is set to Ocean Mesh, the ocean will have lower detail in the preview than in the render in order to speed up the viewport display.