Oops, I neglected to specify which command to use for dragging the mouse. 
Here's a new and improved set of instructions:
How to Resize the Track List and Clip List Tables with VoiceOver and Flo Tools

Occasionally, it might be necessary to resize either the Track List or Clip 
List. One might receive a session whose lists are either too narrow or too 
wide. For example, when trying to click and drag a clip from the Clip List 
table to the timeline, if the Clip List table is too narrow, as VoiceOver 
navigates the table, the mouse pointer can end up outside of the actual table, 
making it impossible to click and drag. The Track List and Clip List tables can 
be resized (that is, widened or narrowed) by clicking and dragging their 
borders, the right edge for the Track List and the left edge for the Clip List. 
When the cursor is in the correct position laterally, the mouse pointer changes 
shape to visually indicate that the table edge will resize if dragged. For 
VoiceOver users, there’s no way to know when the mouse pointer has changed 
shape. So here are instructions for how to resize each table. The procedure is 
similar for each table but slightly different. Before starting, make sure 
VoiceOver is set to report measurements in points rather than inches. Go to 
VoiceOver Utility/Verbosity category/Announcements tab and navigate to the 
"Announce Size and Position In" pop-up menu and select "points."
To determine the width of either table, navigate to a table and press 
VO+Command+f3. VoiceOver will announce the window name along with the session 
name and then report the width and height in points. Make sure the Flo Tools 
Mouse macro group is enabled. Press Command+/ (slash) to toggle the group on or 
off.

Track List Table instructions:
1. Navigate to the Track List pop-up button.
2. Double-tap VO+Command+f3. VoiceOver will report the horizontal and vertical 
coordinates of the pop-up button relative to  the top left corner of the window.
3. Add 21 points to the horizontal coordinate (the first value). For example, 
if the Track List pop-up button is 86 points right and 112 points down, add 21 
to the first number. The new target coordinate would be 107 points right and 
112 points down.
4. Use the "Move Mouse to Coordinates Relative to Current Window" macro to move 
the mouse pointer. Press Command+Option+Shift+w and enter the coordinates. Type 
the horizontal value (the value VoiceOver reported for the Track List pop-up 
button plus 21), a comma then the vertical value with no spaces and press 
Return. You can verify the mouse pointer position with the flo Tools "Copy and 
Speak Mouse Coordinates Relative to Front Window" macro by pressing 
Command+Option+Shift+c.
5. Press VO+Command+Shift+Space Bar to mouse down on the Track List table edge.
6. Drag the Mouse pointer either to the left to narrow or to the right to widen 
the table using Command+Option+Shift+left or right arrow.
7. Press Command+Option+Shift+Space Bar again to mouse up. You can verify the 
results by navigating back to the table and pressing VO+Command+f3 once and 
VoiceOver will report the new width and height of the table.

Clip List Table instructions:
1. Navigate to the Clip List table.
2. Double-tap VO+Command+f3. VoiceOver will report the horizontal and vertical 
coordinates of the table relative to the top left corner of the window.
3. Subtract 1 point from the horizontal coordinate (the first value). For 
example, if the Clip List table is 1331 points right, subtract 1. The new 
target coordinate would be 1330 points right.
4. Use the "Move Mouse to Coordinates Relative to Current Window" macro to move 
the mouse pointer. Press Command+Option+Shift+w and enter the coordinates. Type 
the horizontal value (the value VoiceOver reported for the Clip List table 
minus 1), a comma then the vertical value with no spaces and press Return. 
Please note that the vertical (down) value or the second number) should be the 
same as the Track List and Clip List pop-up buttons’ vertical values (which are 
the same. Most likely, it’ll be a value like 112.
5. Press VO+Command+Shift+Space Bar to mouse down on the Clip List table edge.
6. Drag either to the left to narrow or to the right to widen the table Using 
Command+Option+Shift+left or right arrows.
7. Press Command+Option+Shift+Space Bar again to mouse up. You can verify the 
results by navigating back to the table and pressing VO+Command+f3 once and 
VoiceOver will report the new width and height of the table.

A few additional notes:
Generally, the narrowest width for either table defaults to either 80 or 86 
points. If you continue to drag to narrow even further, at a certain point, the 
table will simply disappear as Pro Tools thinks you want to hide the table. To 
once again display the table, press the respective table Show/Hide buttons.

Last modified on April 28 at 5 P.M. EDT

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