The Fix Subtitles tool is there to clean your project file against various rules of your choice.
Fix Subtitles can be started from the Titles drop-down menu or from the corresponding button on the toolbar to display the following window:
Fix Subtitles
Available Fix Subtitles options are divided into separate categories for easier navigation and clean preview of the selected options. Whenever there is at least one of selected for a category, category's name would be marked in bold and the checkbox in front of it will look like a square- 
. And when all options are clicked for a category, the checkbox in front of its name becomes fully checked - 
.
Show fix summary - when enabled displays summary of the subtitles that has been affected by the different fix options. Otherwise, when disabled, modified subtitles will directly be send to the Log List for verification.
Note: We'd like to recommend you to always pay attention to the Fix summary for subtitles that couldn't be modified automatically. It's quite possible, if not certain, that there will be conflicts considering the large variety of parameters involved in the process. Some problems may require the text to be split or the In-cues to be adjusted before they can be resolved and "Fix Subtitles" isn't designed to modify the text or move the In-cues of the subtitles. In-cues are handled with greatest priority by the Fix Subtitles function.
Range options
Fix Subtitles can be started for all subtitles in the project or just for some of them using the options in the Range section.
For projects with more tracks, Fix Subtitles can be started for the selected (Default), Main or Secondary tracks or both Main & Secondary tracks at the same time. And, in addition the Filter drop-down allows you to run Fix Subtitles for selected number of subtitles only.
Creating Fix presets
EZTitles also provides the functionality to create Presets with the most frequently used "Fix" options.
To add new preset you can simply press the triangular button 
and select the Create New Preset option. All currently selected "Fix" options will be added for this preset. To modify the currently selected preset you just need to click the "Fix" options you want to activate or disable and then select the Save current preset option after clicking the triangular button. From the same menu you can also Delete or Rename the currently activated preset.
You can select another of your "Fix" Presets directly from the the Presets drop-down menu.