You can quickly change your study settings while on the study page, by accessing the gear icon in the upper right hand corner.
A new window will pop open allowing you to adjust your study settings.
Filter parts: Enable or disable writing, reading, or definition prompts
Hide Reading: Enable or disable the kana reading from prompts (tap to reveal)
Raw Squigs: Enable or disable raw squigs (see your own handwriting)
Teaching Mode: Enable or disable teaching mode (stroke by stroke guide for new characters)
Audio:Enable or disable audio pronunciation for words
Once done, tap Save to apply the changes