you can reorder clips in a gallery by either name, title, file type, duration, in timecode, out timecode or reel name by right clicking in the gallery and choosing arrange thumbnails.
all icons are sorted and arranged starting in the upper left and filling right leaving no spaces and wrapping to the next row after all columns in the visible area are filled.
when scaling the window the right margin will not contain a new column of grid spaces until an entire grid space can be contained.
manually reordering clips in a gallery
to move a clip, select it and drag the cursor to an existing clip location. at the new location a film strip icon appears, and when you release the mouse button the clip appears at the new location, shifting all the existing clips to the right.
when dragging an icon to a occupied grid space, the thumbnail occupying the grid space is always bumped right.
thumbnail bumping happens when a clip is placed into a grid space occupied by another clip. the first clip inserts itself into the second clip's position and the second clip moves to the next space to the right.
manual arrange
manual arrange mode allows you to leave spaces in the gallery between clips.
to turn on manual arrange mode, right click in a gallery and choose arrange thumbnails ] manual. the menu closes. if you look at the menu again, there is now a check next to manual.
now, if you drag a clip to a new location within a gallery, the space it vacates is left empty, and when you try to move clips to the locations currently held by other clips, those clips are bumped to the right.
resizing a gallery
if you are not using manual arrange, you cannot have spaces between clips in the gallery. if you drag the sides, top or bottom of the gallery, the clips shift so that all thumbnails can be seen, until the point where the gallery is so small that there is not room for all the clips in it to be visible at the same time. then a slider appears at the right side of the gallery so you can scroll up and down to see all the clips.
if manual arrange is turned on and you rescale the gallery so that it is smaller or larger, thumbnails do not auto arrange. rows and columns can be created outside of the current window. when you bump a clip, spaces are consumed (an empty space can be filled in by bumping clips). new clips appear after the last clip in the gallery. both vertical and horizontal scroll bars appear on the screen if necessary to allow you to see all the clips in a gallery.