Trace layer
Have option to layer a semi opaque trace over items so can mark up clearly over images/diagrams etc

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Brooke commented
The topics listed here—layers, transparency, locking, merging, grouping, object order, visibility, and rearranging—can all be tackled if Goodnotes introduces a layers feature.
If we all vote for the most popular topic, we’d reach 3,150 votes for layers! Coming together increases our chances of getting this highly requested and essential feature. Voting now is crucial, as Goodnotes is beta testing major updates to the app.
VOTE HERE -----> https://bit.ly/vote-here-to-group-votes-for-more-power
current votes 2257 + 893 from others = 3150
# of votes per other posts:
18 - https://bit.ly/superimpose-v18
5 - https://bit.ly/highlighter-v05
136 - https://bit.ly/lock-v136
7 - https://bit.ly/separate-v07
70 - https://bit.ly/highlight-v70
3 - https://bit.ly/between-v03
4 - https://bit.ly/transparency-v04
1 - https://bit.ly/visibility-v01
41 - https://bit.ly/placement-v41
28 - https://bit.ly/layers-v28
10 - https://bit.ly/invisible-v10
27 - https://bit.ly/rearrange-v27
6 - https://bit.ly/grouping-v06
18 - https://bit.ly/overlay-v18
34 - https://bit.ly/selection-v34
14 - https://bit.ly/structure-v14
6 - https://bit.ly/forward-v06
17 - https://bit.ly/locked-v17
13 - https://bit.ly/objects-v13
3 - https://bit.ly/background-v03
1 - https://bit.ly/layer-pen-v01
41 - https://bit.ly/turn-off-v41
65 - https://bit.ly/opacity-v65
63 - https://bit.ly/overlap-v63
28 - https://bit.ly/layer-drawing-v28
14 - https://bit.ly/foreground-v14
15 - https://bit.ly/merging-v15
7 - https://bit.ly/3I2xNrn paint level
7 - https://bit.ly/47n4WbA layers
1 - https://bit.ly/3JGXAWM concepts app
5 - https://bit.ly/4lTt0X9 object selection
4 - https://bit.ly/4lR9U3W lock images
6 - https://bit.ly/4n8xxGe order images
2 - https://bit.ly/3HZJor9 add layers
2 - https://bit.ly/47VasCu template layer
2 - https://bit.ly/47lEOxV layering
2 - https://bit.ly/4mZvJzT object transparency
3 - https://bit.ly/4n8xTN4 layering objects
1 - https://bit.ly/41yU86t group elements